27


Silverstone Energy Limited
18 March 2008


NOT  FOR  RELEASE,  PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN, INTO OR  FROM  ANY  RELEVANT
JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF SUCH JURISDICTION

18 March 2008
                                                   
                        Recommended Cash Offer of 63.45 pence per Granby Share
                                                   
                                                  for
                                                   
                                   Granby Oil and Gas plc ("Granby")
                                                   
                                                  by
                                                   
                              Silverstone Energy Limited ("Silverstone")
                                                   
Summary and Highlights

The  Directors  of  each  of Granby and Silverstone are pleased to announce  that  they  have  reached
agreement  on  the terms of a recommended cash offer of 63.45 pence per Granby Share  to  be  made  by
Silverstone to acquire the entire issued and to be issued share capital of Granby that is not  already
owned by Silverstone.

The Offer will be made on the following basis:
          
                              for each Granby Share 63.45 pence in cash.

*   The  Offer Price represents a premium of approximately 30.8 per cent. to Granby's share price
    of 48.5 pence at the close of business on 17 March 2008, being the last Business Day prior to this
    announcement.

*   The  terms  of the Offer value Granby's existing issued share capital at approximately  �23.1
    million.

*   Silverstone has received irrevocable undertakings to accept (or procure the acceptance of) the
    Offer in respect of a total of 15,347,540 Granby Shares representing, in aggregate, approximately 42.2
    per cent. of the existing issued share capital of Granby, comprised as follows:

(a)   from  each  of the Granby Directors and/or certain of their connected persons in  respect  of
      Granby Shares held by them and, in certain cases, by their connected persons, and certain other Granby
      Shareholders in respect of their entire beneficial holdings which amount, in aggregate, to 12,331,350
      Granby Shares, representing approximately 33.9 per cent. of the existing issued share capital of
      Granby. These undertakings will continue to be binding even if a competing offer is made for Granby
      which exceeds the value of the Offer and even if such higher offer is recommended for acceptance by
      the Board of Granby; and

(b)   from  certain other Granby Shareholders in respect of, in aggregate, 3,016,190 Granby Shares,
      representing  approximately 8.3 per cent. of the existing issued share capital of Granby.  These
      undertakings will continue to be binding even if a competing offer is made for Granby unless such
      competing offer represents an improvement of not less than 10 per cent. on the value of the Offer.

*     All  of the irrevocable undertakings referred to above will lapse if the Offer lapses  or  is
      withdrawn.

*     The  Directors of Granby, who have been so advised by Granby's advisers Tristone Capital  and
      KBC  Peel Hunt, consider that the terms of the Offer are fair and reasonable.  In providing  their
      advice, Tristone Capital and KBC Peel Hunt have taken into account the commercial assessments of
      the Directors.

*     Accordingly, the Directors of Granby intend to recommend that Granby Shareholders accept  the
      Offer, as those Directors and/or their connected persons, who hold Granby Shares, have irrevocably
      undertaken to do in respect of their beneficial shareholdings or procure to be done in respect  of
      Granby Shares held by their connected persons amounting, in aggregate, to 5,703,304 Granby Shares,
      representing 15.7 per cent. of the existing issued share capital of Granby.

Commenting on the proposed Offer, Matt Brister, Chief Executive Officer of Silverstone said:

"We  recognise real similarities and alignment between the Silverstone and Granby assets in  terms  of
our  project  overlap,  exploration focus and near term first production.  We  are  both  early  stage
exploration  focused North Sea stories and we feel an expanded asset base, including  first  gas  from
Tristan  NW and our Victoria development, will provide a strong platform to test our expanded prospect
inventory and lead to enhanced value delivery to our shareholders."

Ric Piper, Chairman of Granby, said:

"Since  Granby  was  admitted  to  trading on AIM in 2005, the upstream  environment  has  experienced
increasingly  high  costs,  whilst  high  oil and gas prices  have  made  competition  for  attractive
exploration, appraisal and development projects more intense, and suitable producing assets  are  only
rarely available for acquisition.  The Directors of Granby believe that to maintain a sufficient level
of  activity  to  create material growth in value in a reasonable timeframe is  likely  to  require  a
significant increase in overall scale and available capital resources, which would probably result  in
significant dilution of potential returns for all Granby Shareholders. The Directors of Granby believe
that  this  Offer  is  in  the  best interests of Granby Shareholders and,  accordingly,  they  intend
unanimously to recommend that Granby Shareholders accept the Offer."

This  summary should be read in conjunction with the full text of the following announcement  and  the
Appendices.

Appendix 1 sets out the conditions and certain further terms of the Offer. Appendix 2 contains  source
notes relating to certain information contained in this announcement.  Appendix 3 contains details  of
the  irrevocable  undertakings  received  in relation to  the  Offer.   Certain  terms  used  in  this
announcement are defined in Appendix 4 to this announcement.

Enquiries:

RBC Capital Markets              (Financial Adviser to Silverstone)
Andrew Smith                     +44 (0) 20 7653 4000
Martin Eales                     +44 (0) 20 7653 4000
Louise Mooney                    +44 (0) 20 7653 4000

Tristone Capital                 (Financial Adviser to Granby)
Nick Morgan                      +44 (0) 20 7355 5800
Derek Smith                      +44 (0) 20 7355 5800

KBC Peel Hunt                    (Financial Adviser and Nominated Adviser to Granby)
Jonathan Marren                  +44 (0) 20 7418 8900
Matt Goode                       +44 (0) 20 7418 8900

Royal  Bank  of  Canada  Europe Limited, which trades as RBC Capital Markets  and  is  authorised  and
regulated  in  the  United  Kingdom  by the Financial Services Authority,  is  acting  exclusively  as
financial  adviser  to  Silverstone and no one else in connection with  the  Offer  and  will  not  be
responsible to anyone other than Silverstone for providing the protections afforded to clients of  RBC
Capital Markets or for providing advice in relation to the Offer or any other matters referred  to  in
this document.

Tristone  Capital  Limited and KBC Peel Hunt Ltd, each of which is authorised  and  regulated  in  the
United  Kingdom by the Financial Services Authority, are acting exclusively as financial  advisers  to
Granby  and no one else in connection with the Offer and will not be responsible to anyone other  than
Granby  for providing the protections afforded to their respective clients or for providing advice  in
relation to the Offer or any other matters referred to in this document.

This  announcement is not intended to and does not constitute or form any part of an offer to sell  or
an  invitation  to  purchase or the solicitation of an offer to subscribe for any  securities  or  the
solicitation  of  any vote or approval in any jurisdiction pursuant to the Offer  or  otherwise.   The
Offer  will be made solely through the Offer Document and, in the case of certificated Granby  Shares,
the  Form  of  Acceptance,  which will together contain the full terms and conditions  of  the  Offer,
including details of how to accept the Offer.  Any acceptance or other response to the Offer should be
made only on the basis of the information contained in the Offer Document and the Form of Acceptance.

The  release, distribution or publication of this announcement in jurisdictions other than the UK  may
be  restricted by law and therefore any persons who are subject to the laws of any jurisdiction  other
than  the UK should inform themselves about and observe any applicable requirements.  Copies  of  this
announcement and any documentation relating to the Offer are not being, and must not be,  directly  or
indirectly,  mailed  or  otherwise forwarded, distributed or sent in or into or  from  any  Restricted
Jurisdiction  and persons receiving such documents (including custodians, nominees and trustees)  must
not  mail  or  otherwise forward, distribute or send such documents in or into or  from  a  Restricted
Jurisdiction.   The Offer (unless otherwise determined by Silverstone and permitted by applicable  law
and  regulation) will not be made, directly or indirectly, in or into, or by the use of the mails,  or
by  any  means of instrumentality (including without limitation, telephonically or electronically)  of
interstate  or  foreign  commerce  of,  or any facilities of a national  securities  exchange  of  any
Restricted Jurisdiction, and the Offer will not be capable of acceptance from or within any Restricted
Jurisdiction.

This  announcement, including information included or incorporated by reference in this  announcement,
may   contain  "forward-looking  statements"  concerning  Silverstone,  Granby  and  their  respective
subsidiaries.   Generally,  the  words  "will", "may", "should",  "continue",  "believes",  "expects",
Sintends",  "anticipates"  or similar expressions identify forward-looking statements.   The  forward-
looking  statements  involve  risks  and  uncertainties that could  cause  actual  results  to  differ
materially  from  those  expressed  in  the forward-looking  statements.   Many  of  these  risks  and
uncertainties  relate  to  factors that are beyond the companies' abilities  to  control  or  estimate
precisely, such as future market conditions and behaviours of other market participants, and therefore
undue  reliance should not be placed on such statements.  Silverstone and Granby assume no  obligation
and  do  not  intend  to  update  these forward-looking statements, except  as  required  pursuant  to
applicable law.

Dealing disclosure requirements

Under the provisions of Rule 8.3 of the Code, if any person is, or becomes, 'interested' (directly  or
indirectly) in 1 per cent. or more of any class of 'relevant securities' of Granby, all 'dealings'  in
any  'relevant  securities'  of that company (including by means of an option  in  respect  of,  or  a
derivative referenced to, any such 'relevant securities') must be publicly disclosed by no later  than
3.30  p.m.  (London  time)  on the Business Day following the date of the relevant  transaction.  This
requirement will continue until the date on which the Offer becomes, or is declared, unconditional  as
to acceptances, lapses or is otherwise withdrawn or on which the 'Offer Period' otherwise ends. If two
or more persons act together pursuant to an agreement or understanding, whether formal or informal, to
acquire  an  'interest' in 'relevant securities' of Granby, they will be deemed to be a single  person
for the purpose of Rule 8.3.

Under  the  provisions of Rule 8.1 of the Code, all 'dealings' in 'relevant securities' of  Granby  by
Silverstone or Granby, or by any of their respective 'associates', must be disclosed by no later  than
12.00 noon (London time) on the London business day following the date of the relevant transaction.

A  disclosure table, giving details of the companies in whose 'relevant securities' 'dealings'  should
be  disclosed,  and  the number of such securities in issue, can be found on the  Panel's  website  at
www.thetakeoverpanel.org.uk.

'Interests  in  securities'  arise,  in summary, when a person has  long  economic  exposure,  whether
conditional  or  absolute,  to changes in the price of securities. In particular,  a  person  will  be
treated  as having an 'interest' by virtue of the ownership or control of securities, or by virtue  of
any option in respect of, or derivative referenced to, securities.

Terms  in quotation marks are defined in the Code, which can also be found on the Panel's website.  If
you  are in any doubt as to whether or not you are required to disclose a 'dealing' under Rule 8,  you
should consult the Panel.

This  summary should be read in conjunction with the full text of the following announcement  and  the
Appendices.

                                                   
NOT  FOR  RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN, INTO OR FROM  ANY  RESTRICTED
JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF SUCH JURISDICTION

18 March 2008
                                                   
                        Recommended Cash Offer of 63.45 pence per Granby Share
                                                   
                                                  for
                                                   
                                   Granby Oil and Gas plc ("Granby")
                                                   
                                                  by
                                                   
                              Silverstone Energy Limited ("Silverstone")
                                                   
                                                   

1.      Introduction
    
The  Directors  of  each  of Granby and Silverstone are pleased to announce  that  they  have  reached
agreement  on  the terms of a recommended cash offer of 63.45 pence per Granby Share  to  be  made  by
Silverstone to acquire the entire issued and to be issued share capital of Granby that is not  already
owned by Silverstone.

2.      Summary of the recommended Offer

Silverstone  will offer to acquire, on the terms and subject to the conditions set out  below  and  in
Appendix 1 and on the full terms which will be set out in the Offer Document, the entire issued  share
capital of Granby (other than those Granby Shares already held by Silverstone) on the following basis:
          
          for each Granby Share                                            63.45 pence in cash.

The  Offer Price represents a premium of approximately 30.8 per cent. to Granby's share price of  48.5
pence  at  the  close  of  business  on 17 March 2008, being the  last  Business  Day  prior  to  this
announcement.

The terms of the Offer value Granby's existing issued share capital at approximately �23.1 million.

3.      Background to and reasons for the Offer

Silverstone  conducts operations in the southern gas basin of the UKCS and was aware of  the  progress
that Granby has made in assembling a strong asset position and moving towards first gas at Tristan NW.
In  the  course  of evaluating an asset acquisition opportunity that was linked to one of  the  Granby
assets, Silverstone became aware of the possibility that Granby's Board might seek proposals involving
a sale or business combination as a way to deliver value to its shareholders.

The price per share offered to Granby Shareholders under the Offer reflects the value that Silverstone
attributes  to  the proven assets at Tristan NW, the potential value that could be  derived  from  the
reserves  at  Monkwell and Kerloch and the possibility for future value creation from the drilling  of
the exploration prospects currently outlined by Granby.

Silverstone  believes  that  a larger diversified asset portfolio, with a balance  of  production  and
exploration opportunities, will provide a strong platform for its future growth.

4.      Background to and reasons for recommending the Offer

Granby  was formed in 2005, incorporating Granby Enterprises Ltd and Team Oil Ltd, both of  which  had
been  incorporated  in 2002 and had operated under common management from 2004. Granby's  shares  were
admitted to trading on AIM in June 2005.

Granby's  corporate  strategy  has been to create a balanced upstream  oil  and  gas  exploration  and
development  company, predominantly focused on the North Sea, with close integration of technical  and
commercial  expertise.  To date Granby has participated in the drilling of  a  total  of  eight  wells
(including five exploration wells, one appraisal well and two development wells), with a further three
wells planned to be drilled before the end of 2008.

Granby's  exploration  strategy has been to identify and originate material  prospects  that  will  be
sufficiently  attractive to be farmed out to other companies or that could  be  farmed  out  to  cover
drilling  costs,  while  retaining sufficient equity and therefore net reserve  potential  within  the
Group.   The initial exploration focus has been on relatively shallow prospects in relatively  shallow
water.   Granby's  UK North Sea exploration portfolio, the majority of which consists  of  traditional
licences  which  have  been originated by Granby, includes 16 licences covering  27  blocks  (or  part
blocks)  with  prospective net risked resources of 51 million barrels of oil equivalent  ("mmboe")  as
recently  reviewed  independently by TRACS International. In addition  Granby  has  interests  in  one
onshore UK licence and two onshore blocks in Poland.

The  appraisal  and  development strategy has been to secure oil and gas  development  and  production
opportunities  in  order to build a revenue and cash flow base for the business. In implementing  this
strategy  Granby  has participated in two developments since admission to trading on AIM.  Granby  was
instrumentally  involved in transforming the Galoc oil field in offshore Philippines from  a  formerly
stranded  discovery  into a commercial development, selling its interest in December  2007  for  $16.7
million  (�8.5  million).  Granby  is also operator of the Tristan  NW  development,  which  has  been
successfully  flow  tested  at 30 million standard cubic feet per day  of  gas.   Despite  delays  and
additional costs, predominantly caused by unusually adverse weather conditions, the project  is  close
to  completion,  with  production expected to begin in April 2008. Granby also has  interests  in  two
appraisal projects: the Kerloch discovery, which was drilled in December 2007 and in which Granby  has
a  10  per cent. interest; and the Monkwell gas discovery which has a well planned during 2008 and  in
which Granby has a 20 per cent. interest.

Since Granby was admitted to trading on AIM in 2005, the associated costs of operating in the oil  and
gas  sector,  and  particularly  in  the  North Sea, have steadily  increased.  This  increasing  cost
environment  combined  with  a  very tight market in the supply of all the  necessary  field  services
required  to  manage an exploration and production portfolio, have made it more difficult for  smaller
companies  to  grow.  A broad portfolio of exploration and production assets is  required  to  provide
investors  with  multiple opportunities for meaningful growth at an appropriate level  of  risk,  when
spread  across the whole portfolio. Such a portfolio requires a significantly higher level of  capital
resources  than  Granby  currently has and also requires a greater degree of  capital  flexibility  to
manage the risk of cost overruns that such capital projects usually incur.

In  view  of  the  increasingly high costs in the upstream environment, it has  become  clear  to  the
Directors of Granby that a company of Granby's capital resources is unlikely to be able to maintain  a
sufficient  level  of activity of operations in the upstream oil and gas sector to create  significant
growth in value for shareholders in a reasonable timeframe. The Board believes that to achieve such an
increase in scale has become much more difficult as high oil and gas prices have made competition  for
attractive exploration, appraisal and development projects more intense, and suitable producing assets
are rarely available for acquisition.  The economics of smaller projects have become more marginal and
less  attractive  as  a consequence of sharply increasing costs. The investment community  has  become
increasingly  focused  on  larger companies which can provide liquidity and  materiality  while  still
providing  exposure  to significant potential gains from exploration success. A material  increase  in
capital  resources  for Granby would probably result in significant dilution of the potential  returns
for all Granby Shareholders.

Taking into account all the factors detailed above, the Directors of Granby believe that it is in  the
best  interests  of  Granby  Shareholders  for the Offer to be  made  and,  accordingly,  they  intend
unanimously to recommend that Granby Shareholders accept the Offer.

5.      Directors' recommendation

The  background and reasons for recommending the Offer are set out above under section 4 above of this
announcement.

The Directors of Granby, who have been so advised by Tristone Capital and KBC Peel Hunt, consider that
the  terms of the Offer are fair and reasonable.  In providing their advice, Tristone Capital and  KBC
Peel Hunt have taken into account the commercial assessments of the Directors.

The  Directors  of Granby, therefore, unanimously recommend that you accept the Offer,  as  they  have
irrevocably  undertaken  to do in respect of their own beneficial holdings (or  in  certain  cases  to
procure  to be done in respect of Granby Shares held by certain of their connected persons) amounting,
in  aggregate,  to  5,703,304  Granby Shares, representing 15.7 per cent.  of  Granby's  issued  share
capital.

6.      Irrevocable undertakings

Silverstone has received irrevocable undertakings to accept (or procure the acceptance of)  the  Offer
in  respect of a total of 15,347,540 Granby Shares representing, in aggregate, approximately 42.2  per
cent. of the existing issued share capital of Granby, comprised as follows:

(a)       from  each  of the Granby Directors and/or certain of their connected persons in respect  of
          Granby  Shares held by them and, in certain cases, by their connected persons,  and  certain
          other  Granby Shareholders in respect of their entire beneficial holdings which  amount,  in
          aggregate,  to 12,331,350 Granby Shares, representing approximately 33.9 per  cent.  of  the
          existing issued share capital of Granby. These undertakings will continue to be binding even
          if  a  competing offer is made for Granby which exceeds the value of the Offer and  even  if
          such higher offer is recommended for acceptance by the Board of Granby; and

(b)       from certain other Granby Shareholders in respect of, in aggregate, 3,016,190 Granby Shares,
          representing  approximately 8.3 per cent. of the existing issued share  capital  of  Granby.
          These  undertakings will continue to be binding even if a competing offer is made for Granby
          unless  such competing offer represents an improvement of not less than 10 per cent. on  the
          value of the Offer.

All of the irrevocable undertakings referred to above will lapse if the Offer lapses or is withdrawn.

Further details of the irrevocable undertakings are contained in Appendix 3 to this announcement.

7.      Inducement fee

Granby  has  agreed, pursuant to an inducement fee letter dated 18 March 2008, to pay  Silverstone  an
inducement fee of �230,000 (exclusive of VAT, unless such VAT is not recoverable by Granby).  Such fee
shall be payable if:

(a)     the  Directors of Granby (or any of them) withdraw or modify their recommendation of the Offer
        in  a  manner  which  is adverse to Silverstone and at anytime thereafter the  Offer  is  then
        withdrawn  or  lapses in circumstances where Silverstone is not in breach of  its  obligations
        under the Code to make or proceed with the Offer; or
        
(b)     if a competing Offer for Granby is announced (with or without pre-conditions) by a third party
        and  such  competing  Offer  is  recommended by the Directors  of  Granby  and  the  Offer  by
        Silverstone subsequently lapses or is withdrawn.
        
Pursuant  to Rule 21.2 of the Code, Granby, Tristone Capital and KBC Peel Hunt have confirmed  to  the
Panel that they consider these arrangements to be in the best interests of Granby Shareholders.

Granby has also agreed under the inducement fee letter that it will not, during the "Conditional Offer
Period",  (i) sell or recommend the sale of all or any part of its or any Granby Group member's  share
capital  or  the  whole  or substantially the whole of its or any Granby Group member's  business  and
assets  to  any  third  party,  (ii) directly or indirectly initiate,  solicit  or  invite  enquiries,
proposals or offers relating to a Relevant Acquisition or Takeover Offer from any third party or (iii)
grant  to  any  third party access to confidential and other information relating to  Granby  and  the
Granby  Group  for the purposes of evaluating a Relevant Acquisition or Takeover Offer without  having
first informed Silverstone.

If  an  unsolicited approach is received from a third party in relation to a Takeover Offer where  the
Directors  of Granby consider the approach to be by a bona fide potential offeror and it has  informed
Silverstone  and  it  has agreed appropriate confidentiality obligations with the  third  party,  then
Granby  is  released from its obligations in relation to providing due diligence information  to  such
third party insofar as is necessary for Granby to comply with Rule 20.2 of the Code.

Granby has also agreed not at any stage prior to the Offer lapsing or being withdrawn to pay or  enter
into any agreement to pay an inducement fee or a break fee to a third party.

For  the purposes of this paragraph, "Conditional Offer Period" means the period starting on 18  March
2008  and ending on the earlier of the Offer becoming or being declared unconditional in all respects,
the  Offer  lapsing or being withdrawn and the payment by Granby to Silverstone of an Inducement  Fee.
"Takeover  Offer"  has  the meaning ascribed to the expression "Offer" under  the  Code  and  includes
schemes of arrangement.

8.      Financing the Offer

The  cash consideration payable under the Offer will be funded through the existing cash resources  of
Silverstone.  RBC  Capital Markets is satisfied that sufficient financial resources are  available  to
Silverstone to satisfy in full the cash consideration payable to Granby Shareholders in the  event  of
full acceptance of the Offer.

9.      Information on Silverstone

Silverstone is an exploration and production company and currently operates exclusively in  the  UKCS.
It  is  recognised as an exploration operator and as a production operator by BERR and has made  three
gas  discoveries (Vanquish, Victoria and Vulcan East).  Silverstone anticipates drilling at least  one
exploration well and completing a Victoria field development well later this year.  The development of
the  Victoria field has been approved by BERR and first gas is expected later this year.   Silverstone
does not have production at the date of this Offer.

For the year ended 31 December 2007, Silverstone recorded a loss after tax of �245,000 (2006: loss  of
�563,000) and had net assets at that date of �79.7 million.

Further financial information on Silverstone will be set out in the Offer Document.

10.     Information on Granby

Granby  was formed in 2005, incorporating Granby Enterprises Ltd and Team Oil Ltd, both of  which  had
been  incorporated  in 2002 and had operated under common management from 2004. Granby's  shares  were
admitted to trading on AIM in June 2005.

Granby's  corporate  strategy  has been to create a balanced upstream  oil  and  gas  exploration  and
development  company, predominantly focused on the North Sea, with close integration of technical  and
commercial  expertise.  To date Granby has participated in the drilling of  a  total  of  eight  wells
(including five exploration wells, one appraisal well and two development wells), with a further three
wells planned to be drilled before the end of 2008.

For the year ended 31 March 2007, Granby recorded a loss after tax of �1.8 million (2006: loss of �2.9
million) and had net assets at that date of �14.3 million.

Further financial information on Granby will be set out in the Offer Document.

11.     Current trading and prospects of Granby

The current financial year has been one of significant change for Granby. Having started the year with
�7.3 million net cash, the sale of Granby's interest in the Galoc project realised $16.7 million (�8.5
million) in December 2007. However Granby has a 54.0 per cent. interest in the Tristan NW development,
and  although the cost of funding this interest was expected to be �2.5 million the subsequent  delays
and  cost  over-runs have meant that Granby's investment in the project is expected to rise  to  �10.0
million. After allowing for expenditure committed but not yet paid on Tristan NW the uncommitted  cash
available at 31 March 2008 is expected to be approximately �7.3 million.

The  additional  costs of the Tristan NW project have exceeded the funding available  to  the  smaller
partner  in the project and so it is probable that Granby will be required to fund approximately  �1.9
million of costs on their behalf in return for which Granby would acquire an additional 10.3 per cent.
interest  in  the  project for no additional consideration. Whilst this would have a positive  overall
impact  on the value of the Tristan NW development to Granby, it would also reduce the amount of  cash
available  to the remainder of the business and therefore impact on Granby's work programme  prior  to
the arrival of significant revenues from Tristan NW from early 2009.

12.     Management and employees

Silverstone intends to fulfil all contractual and statutory requirements pertaining to the  employment
of  all existing management and employees. Silverstone will meet with all management and employees  of
Granby,  as  soon  as deemed appropriate by the Directors of Granby, to discuss and  understand  their
responsibilities and career aspirations. If the Offer becomes or is declared wholly unconditional, the
Board  of Silverstone will consider the possibility of moving the current Granby London operations  to
Silverstone's Aberdeen office and if such a move is appropriate the timing of such a move.  The  Board
of  Silverstone  has given assurances to the Board of Granby that it will consult with the  management
and employees of Granby in relation thereto.

13.     Granby Share Option Schemes

The  Offer will extend to all Granby Shares unconditionally allotted or issued fully paid (or credited
as  fully  paid)  prior to the date on which the Offer closes as a result of the exercise  of  options
granted  under the Granby Share Option Schemes. Silverstone will, to the extent required by the  Code,
make appropriate proposals to holders of options under the Granby Share Option Schemes in due course.

None  of  the  existing options over Granby Shares have an exercise price below the  Offer  Price  and
therefore it is unlikely that any proposals will be required.

The  attention  of  participants  in the Granby Share Option Schemes  is  drawn  to  the  letter  from
Silverstone to be contained in Part II of the Offer Document.

14.     Disclosure of interests in relevant securities of Granby

At the date of this announcement, Silverstone does not own any of the issued share capital of Granby.

As  at  the date of this announcement, save as disclosed above (including the irrevocable undertakings
referred to above and the Granby Shares represented thereby), neither Silverstone nor, so far  as  the
Directors of Silverstone are aware, any person acting in concert with it has any interest in or  right
to  subscribe for any relevant securities of Granby nor are they party to any short positions (whether
conditional or absolute and whether in money or otherwise) relating to relevant securities of  Granby,
including  any  short positions under derivatives, agreements to sell or any delivery  obligations  or
rights to require another person to purchase or take delivery of any relevant securities of Granby nor
does  any  such  person  have any arrangement in relation to relevant securities  of  Granby.  Neither
Silverstone nor the Directors of Silverstone nor, so far as Silverstone is aware, any person acting in
concert with Silverstone, has borrowed or lent any relevant securities of Granby.

For  these  purposes, 'interest' includes any long economic exposure, whether conditional or absolute,
to  changes in the prices of securities.  A person is treated as having an 'interest' by virtue, inter
alia,  of  the  ownership  or  control of securities or by virtue of any  option  in  respect  of,  or
derivative referenced to, securities. 'Relevant securities' in Granby include any securities of Granby
which are being offered for under the Offer or carry voting rights, any equity share capital of Granby
and any securities of Granby carrying conversion or subscription rights into any of the foregoing.

15.     Cancellation of trading, compulsory acquisition and re-registration as a private company

If  the  Offer becomes or is declared unconditional in all respects and if sufficient acceptances  are
received  under  the Offer, Silverstone intends to exercise its rights pursuant to the  provisions  of
Part  28  of the Companies Act 2006 to acquire compulsorily the remaining Granby Shares to  which  the
Offer relates on the same terms as the Offer.

If  Silverstone acquires, by virtue of its shareholdings and acceptances of the Offer,  Granby  Shares
carrying at least 75 per cent. of the voting rights of Granby, subject to the Offer becoming or  being
declared unconditional in all respects, and subject to any applicable requirements of AIM, as soon  as
practicable  thereafter Silverstone intends to procure that Granby applies to AIM to cancel  admission
of its shares to trading on AIM.

The  cancellation  of  admission  to trading on AIM of Granby Shares would  significantly  reduce  the
liquidity and marketability of any Granby Shares held by Granby Shareholders who have not accepted the
Offer.

It  is  proposed  that  as  soon  as  practicable following  the  Offer  becoming  or  being  declared
unconditional in all respects Granby will be re-registered as a private company.

16.     General

Your attention is drawn to the further information contained in the Appendices which form part of this
announcement.

The  full  text  of the conditions of the Offer, which will be subject to the Code,  are  set  out  in
Appendix  1  to this announcement, which forms part of, and should be read in conjunction  with,  this
announcement.

Appendix  2 to this announcement provides details of the bases of calculations and sources of  certain
information included in this announcement.

Appendix  3 to this announcement contains details of the irrevocable undertakings received in relation
to the Offer.

Appendix 4 to this announcement contains definitions of certain terms used in this announcement.

In  accordance with Rule 2.10 of the Code, Granby confirms that it has 36,404,762 ordinary  shares  of
0.5  pence  each in issue.  The International Securities Identification Number ("ISIN")  for  Granby's
ordinary shares is GB00B085N744.

The  Offer Document setting out in full the terms and conditions of the Offer is expected to be posted
to Granby Shareholders as soon as practicable and must, in any event, be posted to Granby Shareholders
not later than 28 days after the date of this announcement unless otherwise agreed with the Panel.

Enquiries:

RBC Capital Markets              (Financial Adviser to Silverstone)
Andrew Smith                     +44 (0) 20 7653 4000
Martin Eales                     +44 (0) 20 7653 4000
Louise Mooney                    +44 (0) 20 7653 4000

Tristone Capital                 (Financial Adviser to Granby)
Nick Morgan                      +44 (0) 20 7355 5800
Derek Smith                      +44 (0) 20 7355 5800

KBC Peel Hunt                    (Financial Adviser and Nominated Adviser to Granby)
Jonathan Marren                  +44 (0) 20 7418 8900
Matt Goode                       +44 (0) 20 7418 8900

Royal  Bank  of  Canada  Europe Limited, which trades as RBC Capital Markets  and  is  authorised  and
regulated  in  the  United  Kingdom  by the Financial Services Authority,  is  acting  exclusively  as
financial  adviser  to  Silverstone and no one else in connection with  the  Offer  and  will  not  be
responsible to anyone other than Silverstone for providing the protections afforded to clients of  RBC
Capital Markets or for providing advice in relation to the Offer or any other matters referred  to  in
this document.

Tristone  Capital  Limited and KBC Peel Hunt Ltd, each of which is authorised  and  regulated  in  the
United  Kingdom by the Financial Services Authority, are acting exclusively as financial  advisers  to
Granby  and no one else in connection with the Offer and will not be responsible to anyone other  than
Granby  for providing the protections afforded to their respective clients or for providing advice  in
relation to the Offer or any other matters referred to in this document.

This  announcement is not intended to and does not constitute or form any part of an offer to sell  or
an  invitation  to  purchase or the solicitation of an offer to subscribe for any  securities  or  the
solicitation  of  any vote or approval in any jurisdiction pursuant to the Offer  or  otherwise.   The
Offer  will be made solely through the Offer Document and, in the case of certificated Granby  Shares,
the  Form  of  Acceptance,  which will together contain the full terms and conditions  of  the  Offer,
including details of how to accept the Offer.  Any acceptance or other response to the Offer should be
made only on the basis of the information contained in the Offer Document and the Form of Acceptance.

The  release, distribution or publication of this announcement in jurisdictions other than the UK  may
be  restricted by law and therefore any persons who are subject to the laws of any jurisdiction  other
than  the UK should inform themselves about and observe any applicable requirements.  Copies  of  this
announcement and any documentation relating to the Offer are not being, and must not be,  directly  or
indirectly,  mailed  or  otherwise forwarded, distributed or sent in or into or  from  any  Restricted
Jurisdiction  and persons receiving such documents (including custodians, nominees and trustees)  must
not  mail  or  otherwise forward, distribute or send such documents in or into or  from  a  Restricted
Jurisdiction.   The Offer (unless otherwise determined by Silverstone and permitted by applicable  law
and  regulation) will not be made, directly or indirectly, in or into, or by the use of the mails,  or
by  any  means of instrumentality (including without limitation, telephonically or electronically)  of
interstate  or  foreign  commerce  of,  or any facilities of a national  securities  exchange  of  any
Restricted Jurisdiction, and the Offer will not be capable of acceptance from or within any Restricted
Jurisdiction.

This  announcement, including information included or incorporated by reference in this  announcement,
may   contain  "forward-looking  statements"  concerning  Silverstone,  Granby  and  their  respective
subsidiaries.   Generally,  the  words  "will", "may", "should",  "continue",  "believes",  "expects",
"intends",  "anticipates"  or similar expressions identify forward-looking statements.   The  forward-
looking  statements  involve  risks  and  uncertainties that could  cause  actual  results  to  differ
materially  from  those  expressed  in  the forward-looking  statements.   Many  of  these  risks  and
uncertainties  relate  to  factors that are beyond the companies' abilities  to  control  or  estimate
precisely, such as future market conditions and behaviours of other market participants, and therefore
undue  reliance should not be placed on such statements.  Silverstone and Granby assume no  obligation
and  do  not  intend  to  update  these forward-looking statements, except  as  required  pursuant  to
applicable law.

Dealing disclosure requirements

Under the provisions of Rule 8.3 of the Code, if any person is, or becomes, 'interested' (directly  or
indirectly) in 1 per cent. or more of any class of 'relevant securities' of Granby, all 'dealings'  in
any  'relevant  securities'  of that company (including by means of an option  in  respect  of,  or  a
derivative referenced to, any such 'relevant securities') must be publicly disclosed by no later  than
3.30  p.m.  (London  time)  on the Business Day following the date of the relevant  transaction.  This
requirement will continue until the date on which the Offer becomes, or is declared, unconditional  as
to acceptances, lapses or is otherwise withdrawn or on which the 'Offer Period' otherwise ends. If two
or more persons act together pursuant to an agreement or understanding, whether formal or informal, to
acquire  an  'interest' in 'relevant securities' of Granby, they will be deemed to be a single  person
for the purpose of Rule 8.3.

Under  the  provisions of Rule 8.1 of the Code, all 'dealings' in 'relevant securities' of  Granby  by
Silverstone or Granby, or by any of their respective 'associates', must be disclosed by no later  than
12.00 noon (London time) on the London business day following the date of the relevant transaction.

A  disclosure table, giving details of the companies in whose 'relevant securities' 'dealings'  should
be  disclosed,  and  the number of such securities in issue, can be found on the  Panel's  website  at
www.thetakeoverpanel.org.uk .

'Interests  in  securities'  arise,  in summary, when a person has  long  economic  exposure,  whether
conditional  or  absolute,  to changes in the price of securities. In particular,  a  person  will  be
treated  as having an 'interest' by virtue of the ownership or control of securities, or by virtue  of
any option in respect of, or derivative referenced to, securities.

Terms  in quotation marks are defined in the Code, which can also be found on the Panel's website.  If
you  are in any doubt as to whether or not you are required to disclose a 'dealing' under Rule 8,  you
should consult the Panel.
                                                   

                                                                                                      
                                              APPENDIX 1
                                                   
                                 CONDITIONS AND CERTAIN FURTHER TERMS
                                             OF THE OFFER
                                                   

The Offer is subject to the following conditions:

(a)   valid acceptances being received (and not, where permitted, withdrawn) by not later than 1.00
      p.m. (London time) on the first closing date of the Offer (or such later time(s) and/or date(s) as
      Silverstone may, subject to the rules of the Code or with the consent of the Panel, decide) in respect
      of not less than 90 per cent. (or such lower percentage as Silverstone may decide) in nominal value of
      the Granby Shares to which the Offer relates and not less than 90 per cent. (or such lower percentage
      as  Silverstone may decide) of the voting rights carried by the Granby Shares to which the Offer
      relates, provided that this condition will not be satisfied unless Silverstone (together with its
      wholly-owned subsidiaries) shall have acquired or agreed to acquire (whether pursuant to the Offer or
      otherwise) directly or indirectly Granby Shares carrying in aggregate more than 50 per cent. of the
      voting rights then normally exercisable at general meetings of Granby, including for this purpose
      (except to the extent, if any, required by the Panel) any such voting rights attaching to Granby
      Shares  that  are  unconditionally allotted or issued before the Offer becomes  or  is  declared
      unconditional as to acceptances, whether pursuant to the exercise of any outstanding subscription or
      conversion rights or otherwise.

      For the purposes of this condition:
      
      (i)     Granby Shares which have been unconditionally allotted shall be deemed to carry the voting
              rights which they will carry upon issue;
      
      (ii)    the expression "Granby Shares to which the Offer relates" shall be construed in accordance
              with Part 28 of the Act; and
      
      (iii)   valid acceptances shall be deemed to have been received in respect of any Granby Shares which
              Silverstone shall, pursuant to section 979 of the Act, be treated as having acquired or contracted to
              acquire by virtue of acceptance of the Offer;

(b)   no Third Party having intervened (as defined below) and there not continuing to be outstanding
      any statute, regulation or order of any Third Party in each case which would or might reasonably be
      expected, to an extent which is material to the Wider Granby Group or the Wider Silverstone Group, as
      the case may be, each taken as a whole, to:

       (i)     make the Offer, its implementation or the acquisition or proposed acquisition by Silverstone
              of any shares or other securities in, or control of, Granby or any member of the Wider Granby Group
              void, illegal or unenforceable in any relevant jurisdiction, or otherwise directly or indirectly
              restrain, prevent, prohibit, restrict or delay the same or impose additional conditions or obligations
              with respect to the Offer or such acquisition, or otherwise impede, challenge or interfere with the
              Offer or such acquisition, or require amendment to the terms of the Offer or the acquisition or
              proposed acquisition of any Granby Shares or the acquisition of control of Granby or the Wider Granby
              Group by Silverstone;

       (ii)    limit or delay, or impose any material limitations on, the ability of Silverstone or any
              member of the Wider Granby Group to acquire or to hold or to exercise effectively, directly or
              indirectly, all or any rights of ownership in respect of shares or other securities in, or to exercise
              voting or management control over, any member of the Wider Granby Group;

       (iii)   require, prevent or materially delay the divestiture by Silverstone of any shares or other
              securities in any member of the Wider Granby Group;

       (iv)    require, prevent or materially delay the divestiture either by Silverstone or by any member of
              the Wider Granby Group of all or any material portion of their respective businesses, assets or
              properties or limit the ability of any of them to conduct any of their respective businesses or to own
              or control any of their respective assets or properties or any portion thereof, in any such case in a
              manner or to an extent which is material in the context of Silverstone Group taken as a whole or, as
              the case may be, the Wider Granby Group taken as a whole;

       (v)     except pursuant to Part 28 of the Act, require Silverstone or any member of the Wider Granby
              Group to acquire, or to offer to acquire, any shares or other securities (or the equivalent) in any
              member of either the Silverstone Group or the Wider Granby Group owned by any third party;

       (vi)    materially limit the ability of Silverstone or any member of the Wider Granby Group to conduct
              or integrate its business, or any part of it, with the businesses or any part of the businesses of any
              other member of the Wider Granby Group; or

       (vii)   otherwise materially and adversely affect the financial or trading position of any member of
              the Wider Granby Group or, as the case may be, the Wider Granby Group taken as a whole,
              
      and all applicable waiting and other time periods during which any Third Party could intervene
      under the laws of any relevant jurisdiction having expired, lapsed or been terminated;

(c)   all  Authorisations which are necessary or are reasonably considered necessary by Silverstone
      in any relevant jurisdiction for or in respect of the Offer or the acquisition or proposed acquisition
      of any shares or other securities in (except pursuant to Part 28 of the Act), or control or management
      of, Granby or any other member of the Wider Granby Group by Silverstone or the carrying on by any
      member  of the Wider Granby Group of its business having been obtained, in terms and in  a  form
      reasonably satisfactory to Silverstone, from all appropriate Third Parties, in each case, where the
      absence of such Authorisation would have a material adverse effect on the Wider Granby Group or the
      Wider  Silverstone Group, as the case may be, each taken as a whole, and all such Authorisations
      remaining in full force and effect and there being no notice or intimation of any intention to revoke,
      suspend, restrict, modify or not to renew any of the same;

(d)   save  as  Publicly  Announced  or  Disclosed there being no  provision  of  any  arrangement,
      agreement, licence, permit, franchise or other instrument to which any member of the Wider Granby
      Group is a party, or by or to which any such member or any material part of its assets is or are or
      may be bound, entitled or subject or any circumstance, which, in each case as a consequence of the
      Offer or the acquisition or proposed acquisition of any shares or other securities in, or control of,
      Granby or any other member of the Wider Granby Group by Silverstone or otherwise, could or might
      reasonably be expected (in any case, to an extent which is or in a manner which is material to the
      Wider Granby Group or the Wider Silverstone Group, as the case may be, each taken as a whole) to
      result in:

       (i)      any  amount of monies borrowed by or any other indebtedness or liabilities (actual  or
              contingent) of, or any grant available to, any member of the Wider Granby Group being or becoming
              repayable or capable of being declared repayable immediately or prior to its stated repayment date or
              the ability of any member of the Wider Granby Group to borrow monies or incur any indebtedness being
              withdrawn or inhibited or becoming capable of being withdrawn;

       (ii)    the creation or enforcement of any mortgage, charge or other security interest over the whole
              or any substantial part of the business, property, assets or interests of any member of the Wider
              Granby Group or any such mortgage, charge or other security interest (wherever created, arising or
              having arisen) becoming enforceable;

       (iii)   any such arrangement, agreement, licence, permit, franchise or instrument, or the rights,
              liabilities, obligations or interests of any member of the Wider Granby Group thereunder, being, or
              becoming capable of being, terminated or adversely modified or affected or any adverse action being
              taken or any obligation or liability arising thereunder;

       (iv)    any asset or interest of any member of the Wider Granby Group being or falling to be disposed
              of or ceasing to be available to any member of the Wider Granby Group or any right arising under which
              any such asset or interest could be required to be disposed of or could cease to be available to any
              member of the Wider Granby Group;

       (v)     any member of the Wider Granby Group ceasing to be able to carry on business under the name
              which it presently carries on its business;

       (vi)    the creation of any liabilities (actual or contingent) by any member of the Wider Granby
              Group;

       (vii)   the rights, liabilities, obligations or interests of any member of the Wider Granby Group
              under any such arrangement, agreement, licence, permit, franchise or other instrument or the interests
              or business of any such member in or with any other person, firm, company or body (or any arrangement
              or arrangements relating to any such interests or business) being terminated or adversely modified or
              affected; or

       (viii)  the financial or trading position or the value of any member of the Wider Granby Group being
              prejudiced or adversely affected; and

       (ix)    no event having occurred which, under any provision of any such arrangement, agreement,
              licence, permit or other instrument, would, or might reasonably be expected to, result in any of the
              events or circumstances which are referred to in paragraphs (i) to (viii) of this condition (d);

(e)   since 31 March 2007 and except as otherwise Publicly Announced or Disclosed, no member of the
      Wider Granby Group having (in any case, to an extent which or in a manner which is material to the
      Wider Granby Group or the Wider Silverstone Group, as the case may be, each taken as a whole):

       (i)     issued or agreed to issue, or authorised the issue of, additional shares of any class, or
              securities convertible into or exchangeable for, or rights, warrants or options to subscribe for or
              acquire, any such shares or convertible securities or transferred or sold any shares out of treasury,
              other than as between Granby and wholly-owned subsidiaries of Granby and other than any shares issued
              or shares transferred from treasury upon the exercise of any options granted under any of the Granby
              Share Option Schemes;

       (ii)    purchased or redeemed or repaid any of its own shares or other securities or reduced or made
              any other change to any part of its share capital;

       (iii)   recommended, declared, paid or made any dividend or other distribution whether payable in cash
              or otherwise or made any bonus issue, other than a distribution by any wholly-owned subsidiary of
              Granby;

       (iv)    except than as between members of the Granby Group, made, committed to make, authorised,
              proposed or announced any change in its loan capital;

       (v)      (other  than any acquisition or disposal in the ordinary course of business  and/or  a
              transaction between Granby and a wholly-owned subsidiary of Granby or between such wholly-owned
              subsidiaries) merged with, demerged or acquired any body corporate, partnership or business or
              acquired or disposed of or transferred, mortgaged, charged or created any security interest over any
              assets or any right, title or interest in any assets, including shares in any undertaking and trade
              investments, or authorised the same;

       (vi)    issued, authorised or approved the issue of, or authorisation of or made any change in or to,
              any debentures;

       (vii)   entered into, varied, or authorised any agreement, transaction, arrangement or commitment
              (whether in respect of capital expenditure or otherwise) which:

              (A)     is of a long term, onerous or unusual nature or magnitude (or which could be reasonably
                        expected to involve an obligation of such a nature or magnitude); or

              (B)     would or might reasonably be expected to restrict the business of any member of the Wider
                        Granby Group; or

              (C)     is other than in the ordinary course of business;

       (viii)  entered into, implemented, effected or authorised any merger, demerger, reconstruction,
              amalgamation, scheme, commitment or other transaction or arrangement in respect of itself or another
              member of the Wider Granby Group otherwise than in the ordinary course of business;

       (ix)    entered into or varied the terms of, any contract, agreement or arrangement with any of the
              directors or senior executives of any member of the Wider Granby Group;

       (x)     taken any corporate action or had any legal proceedings instituted or threatened against it or
              petition presented or order made for its winding-up (voluntarily or otherwise), dissolution or
              reorganisation or for the appointment of a receiver, administrator, administrative receiver, trustee
              or similar officer of or over all or any part of its assets and revenues or any analogous proceedings
              in any jurisdiction or appointed any analogous person in any jurisdiction;

       (xi)    been unable, or admitted in writing that it is unable, to pay its debts or having stopped or
              suspended (or threatened to stop or suspend) payment of its debts generally or ceased or threatened to
              cease carrying on all or a substantial part of its business;

       (xii)   otherwise than in the ordinary course of business, waived or compromised any claim;

       (xiii)  made any  alteration to its memorandum or articles of association;

       (xiv)   made or agreed or consented to:

              (A)     any significant change:

                    (1)     to the terms of the trust deeds constituting the pension scheme(s) established for its
                          directors, employees or their dependants; or

                    (2)     to the benefits which accrue or to the pensions which are payable thereunder; or

                    (3)     to the basis on which qualification for, or accrual or entitlement to such benefits or
                          pensions are calculated or determined; or

                    (4)     to the basis upon which the liabilities (including pensions) of such pension schemes are
                          funded or made; or
              
              (B)     any change to the trustees including the appointment of a trust corporation but excluding any
                        appointment of a member nominated trustee in accordance with existing nomination arrangements or one
                        company appointment to fill a trustee vacancy,
              
       (xv)  proposed,  agreed  to  provide  or  modified the terms of  any  share  option  scheme  or
              incentive scheme of the Wider Granby Group;

       (xvi)  save as between Granby and its wholly-owned subsidiaries, granted any material lease  in
              respect  of  any  of  the leasehold or freehold property owned  or  occupied  by  it  or
              transferred or otherwise disposed of any such property; or

       (xvii)entered  into  any  agreement,  commitment or arrangement or  passed  any  resolution  or
              proposed or announced any intention with respect to any of the transactions, matters  or
              events referred to in this condition (e);

(f)   except as Publicly Announced or Disclosed:

      (i)    there  having been no adverse change or deterioration in the business, assets,  financial
              or  trading  positions or profit of any member of the Wider Granby Group  to  an  extent
              which  is  material  in the context of the Wider Granby Group or the  Wider  Silverstone
              Group, as the case may be, each taken as a whole;

     (ii)    no  contingent  or other liability of any member of the Wider Granby Group having  arisen
              or  become  apparent or increased which is material in the context of the  Wider  Granby
              Group or the Wider Silverstone Group, as the case may be, each taken as a whole;

     (iii)   no  litigation, arbitration proceedings, prosecution or other legal proceedings to  which
              any  member  of  the Wider Granby Group is may or become a party (whether  as  claimant,
              defendant  or otherwise) having been announced or instituted by or against or  remaining
              outstanding against or in respect of any member of the Wider Granby Group which  in  any
              case  might  reasonably be expected to materially and adversely affect the Wider  Granby
              Group or the Wider Silverstone Group, as the case may be, each taken as a whole; and

     (iv)    (other  than  as a result of the Offer) no enquiry or investigation by, or  complaint  or
              reference  to,  any Third Party having been announced or instituted  by  or  against  or
              remaining  outstanding against or in respect of any member of the  Wider  Granby  Group,
              which  in any case materially and adversely affects the Wider Granby Group or the  Wider
              Silverstone Group, as the case may be, each taken as a whole;

(g)   except as Publicly Announced or Disclosed, Silverstone not having discovered:

      (i)     that  any  financial or business or other information concerning the Wider Granby  Group
              disclosed at any time by or on behalf of any member of the Wider Granby Group, whether publicly or to
              Silverstone, is materially misleading or contains any misrepresentation of fact or omits to state a
              fact necessary to make any information contained therein not materially misleading and which was not
              subsequently corrected by specific disclosure either publicly or otherwise to Silverstone to an extent
              which in any case is material in the context of the Wider Granby Group taken as a whole; or

      (ii)    that any member of the Wider Granby Group is subject to any liability (actual or contingent)
              which is not disclosed in Granby's annual report and accounts for the financial year ended 31 March
              2007 or has otherwise been Publicly Announced or Disclosed and which in any case is material in the
              context of the Wider Granby Group or the Wider Silverstone Group, as the case may be, each taken as a
              whole; or

      (iii)   any information which affects the import of any information disclosed at any time by or on
              behalf of any member of the Wider Granby Group to an extent which is material in the context of the
              Wider Granby Group or the Wider Silverstone Group, as the case may be, each taken as a whole.

(h)   except to the extent Publicly Announced or Disclosed, Silverstone not having discovered:

      (i)     that any past or present member of the Wider Granby Group has not complied with any applicable
              legislation or regulations of any jurisdiction with regard to the use, treatment, handling, storage,
              transport, release, disposal, discharge, spillage, leak or emission of any waste or hazardous
              substance or any substance likely to impair the environment or harm human health, or otherwise
              relating to environmental matters or the health and safety of any person, or that there has otherwise
              been any such use, treatment, handling, storage, transport, release, disposal, discharge, spillage,
              leak or emission (whether or not this constituted a non-compliance by any person with any legislation
              or regulations and wherever the same may have taken place) which, in any case, would be reasonably
              likely to give rise to any liability (whether actual or contingent) or cost on the part of any member
              of the Wider Granby Group; or

      (ii)    that there is, or is reasonably likely to be, any liability, whether actual or contingent, to
              make good, repair, reinstate or clean up any property now or previously owned, occupied or made use of
              by any past or present member of the Wider Granby Group or any other property or any controlled waters
              under any environmental legislation, regulation, notice, circular, order or other lawful requirement
              of any relevant authority or third party or otherwise,

      which in any such case is material in relation to the Wider Granby Group or the Wider
      Silverstone Group, as the case may be, each taken as a whole; and
       
(i)   the obtaining of a 'no objection in principle' letter in relation to the transaction from the
      Secretary of State for the Department of Business, Enterprise and Regulatory Reform.

For the purpose of these conditions:

       (i)     "Third Party" means any central bank, government, government department or governmental,
              quasi-governmental, supra-national, statutory, regulatory or investigative body, authority (including
              any national anti-trust or merger control authority), court, trade agency, association, institution or
              environmental body or any other statutory person or statutory body whatsoever in any relevant
              jurisdiction;
       
       (ii)    a Third Party shall be regarded as having "intervened" if it has decided to take, institute,
              implement or threaten any action, proceeding, suit, investigation, enquiry or reference or made,
              proposed or enacted any statute, regulation, decision or order or taken any measures or other steps or
              required any action to be taken or information to be provided and "intervene" shall be construed
              accordingly; and
       
       (iii)    "Authorisations"  means authorisations, orders, grants, recognitions,  determinations,
              certificates, confirmations, consents, licences, clearances, permissions and approvals.

Subject to the requirements of the Panel, Silverstone reserves the right to waive in whole or in  part
all or any of conditions (b) to (i) inclusive.

Conditions (b) to (i) inclusive must be satisfied as at, or waived on or before midnight on  the  21st
day  after  the  later of the first closing date of the Offer and the date on which condition  (a)  is
fulfilled  (or,  in  each case, such later date as Silverstone, with the consent  of  the  Panel,  may
decide).

Except  with  the Panel's consent Silverstone will not invoke any of the above conditions (except  for
condition  (a))  so  as  to  cause the Offer not to proceed, to lapse or to be  withdrawn  unless  the
circumstances  which  give  rise  to  the right to invoke the  relevant  conditions  are  of  material
significance to Silverstone in the context of the Offer.

If Silverstone is required by the Panel to make an offer for the Granby Shares under the provisions of
Rule  9  of the Code, Silverstone may make such alterations to the terms and conditions of the  Offer,
including to condition (a), as are necessary to comply with the provisions of that Rule.

       
                                              APPENDIX 2
                                                   
                                   BASES AND SOURCES OF INFORMATION

                                                   

(a)      The  value  attributed  to  the existing issued share capital of Granby  is  based  upon  the
      36,404,762 Granby Shares in issue on the date hereof.

(b)      Unless otherwise stated, the financial information concerning Granby has been extracted  from
      the audited annual report and accounts for Granby for the relevant period.

(c)      Granby  Share prices have been derived from the AIM Appendix to the Daily Official  List  and
      represent the closing middle market prices on the relevant date.

(d)      References to a percentage of Granby Shares are based on the number of Granby Shares in issue
      as set out in paragraph (a) above.
                                              APPENDIX 3
                                                   
                                       IRREVOCABLE UNDERTAKINGS

Each of the Granby Directors and/or certain of their connected persons has delivered an undertaking to
Silverstone pursuant to which each has irrevocably undertaken to accept (or procure the acceptance of)
the  Offer in respect of Granby Shares held by them and, in certain cases, by their connected  persons
in respect of their entire beneficial holdings which amount, in aggregate, to 5,703,304 Granby Shares,
representing  approximately  15.7 per cent. of the existing issued  share  capital  of  Granby.  These
undertakings  will continue to be binding even if a competing offer is made for Granby  which  exceeds
the  value  of the Offer and even if such higher offer is recommended for acceptance by the  Board  of
Granby

The  following table shows the number of Granby Shares in which each of the Granby Directors  and,  in
certain  cases,  their  connected persons had an interest on the date of the  irrevocable  undertaking
given by him, and in respect of which an irrevocable undertaking was given:
        
     Name                                Number of Granby Shares           Percentage of issued share
                                                                           capital
     David Douglas Grassick                                    2,260,000                           6.2
     Richard Anthony Moreton                                   2,141,639                           5.9
     Nigel John Burton (and family)*                           1,093,291                           3.0
     Ric Piper (and family)                                      178,574                           0.5
     Adam Shutkever                                               29,800                           0.1
                                                                                                      
     Total                                                     5,703,304                          15.7

        *including 193,291 Granby Shares held in a pension trust
                 
                 
In  addition,  Silverstone has received an irrevocable undertaking to accept the  Offer  from  certain
other  Granby Shareholders in respect of their entire beneficial holdings which amount, in  aggregate,
to  6,628,046  Granby Shares, representing approximately 18.2 per cent. of the existing  issued  share
capital  of Granby. These undertakings will continue to be binding even if a competing offer  is  made
for  Granby  which  exceeds the value of the Offer and even if such higher offer  is  recommended  for
acceptance by the Board of Granby.

The  following  table shows the number of Granby Shares in which each of each of  those  other  Granby
Shareholders had an interest on the date of the irrevocable undertaking given by him or  her,  and  in
respect of which an irrevocable undertaking was given:
              
     Name                               Number of Granby Shares            Percentage of issued share
                                                                           capital
     Robert Dennis Moore                                       2,260,000                           6.2
     Peter Robert Whattler                                     2,220,000                           6.1
     Martin Whitehead                                          2,105,070                           5.8
     Susan Alison Heavens                                         42,976                           0.1
                                                                                                      
     Total                                                     6,628,046                          18.2
                 
In  addition, Silverstone has received irrevocable undertakings to accept the Offer from certain other
Granby   Shareholders,   which  amount,  in  aggregate,  to  3,016,190  Granby  Shares,   representing
approximately  8.3 per cent. of the existing issued share capital of Granby.  These undertakings  will
continue  to  be  binding  even if a competing offer is made for Granby unless  such  competing  offer
represents an improvement of not less than 10 per cent. on the value of the Offer by Silverstone.

The following table shows the number of Granby Shares in which each of those other Granby Shareholders
had  an  interest on the date of the irrevocable undertaking given by him or her, and  in  respect  of
which an irrevocable undertaking was given:
              
     Name                                      Number of Granby Shares             Percentage of issued
                                                                                          share capital
     FirstRand (Ireland) plc                   1,825,714                                            5.0
     RMB Australia Holdings Limited            1,190,476                                            3.3
                                                                               
     Total                                     3,016,190                                            8.3
                 
                                              APPENDIX 4
                                                   
                                              DEFINITIONS
                                                   
The following definitions apply throughout this announcement unless the context requires otherwise.

                                             Companies  Act 1985 (as amended) or, where relevant,  the
Act                                          Companies  Act 2006 and where any specific  provision  of
                                             the Companies Act 1985 is referred to, this will include,
                                             where relevant, any equivalent provision of the Companies
                                             Act 2006
                                             
AIM                                          AIM, a market operated by the London Stock Exchange
                                             
BERR                                         Department   for   Business,   Enterprise,   Reform   and
                                             Regulation
                                             
Board                                        as the context requires, the board of directors of Granby
                                             or  the  board of directors of Silverstone and the  terms
                                             "Granby Board" and "Silverstone Board" shall be construed
                                             accordingly
                                             
Business Day                                 any day (other than a public holiday, Saturday or Sunday)
                                             on  which  clearing banks in London are open  for  normal
                                             business
                                             
Closing Price                                the closing middle market quotation of an Granby Share as
                                             derived from the Daily Official List of the London  Stock
                                             Exchange
                                             
Code                                         The City Code on Takeovers and Mergers
                                             
Directors                                    the  directors of Granby or the directors of  Silverstone
                                             at  the date of this document, as the context so requires
                                             and   the   terms  "Directors  of  Granby"   or   "Granby
                                             Directors", or "Directors of Silverstone" or "Silverstone
                                             Directors" shall be construed accordingly
                                             
EEA                                          the European Economic Area
                                             
Form of Acceptance                           the  form  of  acceptance and authority relating  to  the
                                             Offer which will accompany the Offer Document when issued
                                             
Granby or the Company                        Granby Oil and Gas plc
                                             
Granby Group                                 Granby and its subsidiaries and subsidiary undertakings
                                             
Granby Shareholders                          registered holders of Granby Shares
                                             
Granby Share Option Schemes                  The  Granby Oil and Gas plc Approved Share Option  Scheme
                                             2006 and The Granby Oil and Gas plc Approved Share Option
                                             Scheme 2006
                                             
Granby Shares                                the existing unconditionally allotted or issued and fully
                                             paid ordinary shares of 0.5 pence each in the capital  of
                                             Granby  and  any further shares which are unconditionally
                                             allotted  or  issued before the date on which  the  Offer
                                             closes  (or such earlier date or dates, not being earlier
                                             than the date on which the Offer becomes unconditional as
                                             to  acceptances  or,  if later, becomes  or  is  declared
                                             wholly  unconditional,  as Silverstone  may  decide)  but
                                             excluding  in  both cases any such shares held  or  which
                                             become held in treasury
                                             
KBC Peel Hunt                                KBC Peel Hunt Ltd, a wholly owned subsidiary of KBC Group
                                             NV
                                             
Listing Rules                                the  rules and regulations made by the Financial Services
                                             Authority  in  its  capacity as the UK Listing  Authority
                                             under  the  Financial Services and Markets Act  2000  and
                                             contained  in  the UK Listing Authority's publication  of
                                             the same name
                                             
London Stock Exchange                        London Stock Exchange plc
                                             
Offer                                        the  recommended offer to be made by Silverstone  on  the
                                             terms  and  subject to the conditions  set  out  in  this
                                             document  and  the  Form  of Acceptance  and,  where  the
                                             context  so requires, any subsequent revision, variation,
                                             extension, or renewal of such Offer
                                             
Offer Document                               the   document  to  be  published  and  sent  to   Granby
                                             Shareholders containing the Offer
                                             
Offer Price                                  63.45 pence per Granby Share
                                             
Official List                                the Official List of the UK Listing Authority
                                             
Panel                                        The Panel on Takeovers and Mergers
                                             
Publicly Announced or Disclosed              as  specifically  disclosed  in  the  annual  report  and
                                             accounts  for the Granby Group for the year ended  on  31
                                             March  2007 or in the announcement by Silverstone of  its
                                             firm  intention to make the Offer on 18 March 2008 or  in
                                             any  other  announcement made to a Regulatory Information
                                             Service since the date of such annual report and accounts
                                             or as specifically disclosed in writing to Silverstone or
                                             its  advisers  prior to the date of the  announcement  by
                                             Silverstone of its firm intention to make the Offer on 18
                                             March 2008
                                             
RBC or RBC Capital Markets                   Royal Bank of Canada Europe Limited
                                             
Regulatory Information Service               any  of the services set out in Appendix 3 to the Listing
                                             Rules
                                             
Restricted Jurisdiction                      subject  always to the requirements of Rule 30.3  of  the
                                             Code   in   relation   to  the  distribution   of   offer
                                             documentation  to jurisdictions outside the  UK,  whether
                                             inside  or  outside  the  EEA,  any  jurisdiction   where
                                             extension  or acceptance of the Offer would  violate  the
                                             law of that jurisdiction
                                             
Silverstone                                  Silverstone  Energy  Limited which is incorporated  under
                                             the laws of Scotland with registered number SC 279865
                                             
Silverstone Group                            Silverstone  Energy  Limited  and  its  subsidiaries  and
                                             subsidiary undertakings
                                             
Substantial Interest                         a  direct or indirect interest in 20 per cent. or more of
                                             the  voting  or  equity  capital (or  equivalent)  of  an
                                             undertaking
                                             
Tristone Capital                             Tristone Capital Limited
                                             
UK or United Kingdom                         the  United Kingdom of Great Britain and Northern Ireland
                                             (and its dependent territories)
                                             
UKCS                                         United Kingdom Continental Shelf
                                             
UK Listing Authority or UKLA                 the  Financial Services Authority acting in its  capacity
                                             as the competent authority for the purposes of Part VI of
                                             the Financial Services and Markets Act 2000
                                             
Wider Granby Group                           Granby  and  the subsidiaries and subsidiary undertakings
                                             of  Granby  and  associated undertakings  (including  any
                                             joint venture, partnership, firm or company in which  any
                                             member   of  the  Granby  Group  is  interested  or   any
                                             undertaking   in  which  Granby  and  such   undertakings
                                             (aggregating   their   interests)  have   a   Substantial
                                             Interest)
                                             
Wider Silverstone Group                      Silverstone   and   the   subsidiaries   and   subsidiary
                                             undertakings  of Silverstone and associated  undertakings
                                             (including  any  joint  venture,  partnership,  firm   or
                                             company  in which any member of the Silverstone Group  is
                                             interested  or  any undertaking in which Silverstone  and
                                             such  undertakings (aggregating their interests)  have  a
                                             Substantial Interest)
                                             

The  terms "subsidiary" and "subsidiary undertaking", "undertaking" and "associated undertaking"  have
the  meanings given by the Act (but for this purpose ignoring paragraph 20(1)(b) of Schedule 4A of the
Act).

All references to time in this document are to London time.

Words  importing  the  singular  shall include the plural and vice  versa,  and  words  importing  the
masculine gender shall include the feminine or neutral gender.



                                                                
Granby Oil & Gas plc



                                                                

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