RNS Number:1390Q
Marconi Corporation PLC
24 September 2003

The company has received the following three notifications:




Appaloosa Management LP
26 Main Street
Chatham, NJ 07928


22 September 2003



The Directors
Marconi Corporation plc
c/o Mary Skelley
Regent's Place
338 Eutson Road
London NW1 3BT



Dear Sirs



Marconi Corporation plc (the "Company")



We write to notify you of certain information pursuant to the requirements of
s.198 et seq., Part VI of the Companies Act 1985.



As of 22 September 2003, Appaloosa Investments Limited Partnership I of 26 Main
Street, Chatham, New Jersey 07928, USA ("AILP") had a notifiable interest in and
was registered holder of 6,560,435 ordinary shares in the Company (the "Shares
").



For the purposes of s.203 Companies Act 1985 we notify you that there is a
managing entity of AILP: Appaloosa Management Limited Partnership ("AMLP") which
has a notifiable interest in the Shares.  The managing entity of AMLP is
Appaloosa Partners Inc. ("Appaloosa Inc."), which has a notifiable interest in
the Shares, Appaloosa Inc. is controlled by David Tepper who has a notifiable
interest in the Shares.



This notice of interest is given in fulfilment of the obligation of each of
AILP, AMLP Appaloosa Inc. and David Tepper under the requirements of S.198 et
seq., Part VI of the Companies Act 1985 and supersedes all previous notices
given by us pursuant to Part VI of the Companies Act 1985.



Yours faithfully



For and on behalf of

Appaloosa Investment Limited Partnership I


       Aviva plc
       P O Box 89
       Surrey Street
       Norwich NR1 3DR


       22 September 2003



The Company Secretary
Marconi Corporation plc
4th Floor
Regents Place
338 Euston Road
London
NW1 3BT



Dear Sir,



Marconi Corporation plc (The "company") - SEDOL 3335442



This notification supersedes our previous notification to you dated 10 September
2003 and is prompted by net purchases totally 184,100 on 19 September 2003.



This notification relates to issued ordinary shares of 25p each in the capital
of the Company (the "Shares") and is given in fulfilment of the obligations
imposed by sections 198 to 202 of the Companies Act 1985 (the "Act").



1.         Notification on behalf of Morley Fund Management Limited (a
subsidiary of Aviva plc).



1.1               We hereby notify you on behalf of Morley Fund Management
Limited that immediately after the time when the obligation to make this
notification arose Morley Fund Management Limited were interested in 12,077,037
shares.



1.2               The identity of the registered holders of the shares to which
this notification relates and the number of shares held by each of them are set
out in the attached Appendix: Morley Fund Management Limited.



2.                               Notification on behalf of Aviva plc.



2.1                           We hereby notify you on behalf of Aviva plc that
immediately after the time when the obligation to make this notification arose
Aviva plc were interested in 12,077,116 shares giving the Aviva group a total
percentage interest in the shares of 6.03%.



2.2                           The identify of the registered holders of the
shares to which this notification relates and the number of shares held by each
of them are set out in the attached Appendix: Aviva plc.



If you require further information as to which companies in the Aviva group hold
interests in the shares (by virtue of s.203 of the Act) please submit a written
request and we will be happy to supply this information.



We are only required to notify interests which are defined as material interests
when the holding is equal to 3% or more of the Company's relevant share capital.
  The term material interests exclude certain categories where we do not hold a
beneficial interest, for example where the shares are held in an Authorised Unit
Trust Scheme or Open Ended Investment Company.  Holdings in those categories are
therefore not included in the holding notified under this letter.  If you wish
us to confirm the level of holdings in these categories, please let us know.



Yours faithfully,



Diane Thirkettle

For and on behalf of

Aviva plc



The Company Secretary                                       22 September 2003

Marconi Corporation plc



APPENDIX: MORLEY FUND MANAGEMENT LIMITED



REGISTERED HOLDERS                                      NUMBER OF SHARES HELD


BNY Norwich Union Nominees Ltd                              4,007,505 (Material)

Chase GA Group Nominees Ltd                                 5,488,748 (Material)

CUIM Nominee Ltd                                            2,580,784 (Material)



TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED: 6.03%
ISSUE SHARE CAPITAL ON WHICH THIS NOFIICATION IS BASED : 200,400,000





The Company Secretary                                   22 September 2003

Marconi Corporation plc



APPENDIX: AVIVA PLC



REGISTERED HOLDERS                                      NUMBER OF SHARES HELD



BNY Norwich Union Nominees Ltd                         4,007,505 (Material)

Chase GA Group Nominees Ltd                            5,488,748 (Material)

CUIM Nominee Ltd                                       2,580,784 (Material)
                                                       
Ohra Belgium Non-Life                                         79 (Material)



TOTAL PERCENTAGE INTEREST OF AVIVA PLC: 6.03%
ISSUE SHARE CAPITAL ON WHICH THIS NOFIICATION IS BASED : 200,400,000






       Fidelity Investments
       82 Devonshire Street
       Boston, MA 0210903614


Marconi Corporation Plc
338 Euston Rd, 4th Floor
Regents Place
London NW1 3BT



Attn: Company Secretary




       September 23, 2003



Dear Sirs,



Enclosed are amended notifications of disclosable interests under the U.K.
Companies Act 1985.  Please note that while this information details the
disclosable interests of more than one entity, the enclosed disclosure
constitutes separate notifications of interests which have been combined solely
for purposes of clarity and efficiency.  It is not intended to indicate that any
of these entities act as a group or in concert with respect to these interests.



These disclosures are made in the interest of conformity with the Companies Act.
  The Interest detailed herein were acquired solely for investment purposes.
For disclosure purposes, holdings should be represented as FMR Corp. and its
direct and indirect subsidiaries, and Fidelity International Limited (FIL) and
its direct and indirect subsidiaries, both being non-beneficial holders.



If you have any questions please contact Eleanor Chemlen at (617) 563-1416 or by
Fax at (617) 476-0363.



Kindest regards



Eleanor Chemlen

Sr. Compliance Specialist





Amendment #7



NOTIFICATIONS UNDER SECTIONS 198 TO 202 - U.K. COMPANIES ACT





1. Company in which shares are held:     Marconi Corporation Plc



2. Notifiable Interest:     Ordinary Shares



(A)



FMR Corp.

82 Devonshire Street

Boston, MA 02109



Parent holding company of Fidelity Management & Research Company (FMRCO),
investment manager for US mutual funds and Fidelity Management Trust Company
(FMTC), a US state chartered bank which acts as a trustee or investment manager
of various pension and trust accounts.  (See Schedule A for listing of
Registered Shareholders and their holdings.)



(B)



Fidelity International Limited (FIL)
P.O. Box HM 670

Hamilton HMCX, Bermuda



Parent holding company for various direct and indirect subsidiaries, including
Fidelity Investment Services Ltd. (FISL) and Fidelity Pension Management (FPM),
investment managers for various non-US investment companies and institutional
clients. (See Schedule A for listing of Registered Shareholders and their
holdings.)



3. The notifiable interests also comprise the notifiable interest of:



Mr. Edward C. Johnson 3d

82 Devonshire Street

Boston, MA 02109



A principal shareholder of FMR Corp. and Fidelity International Limited.



4. The notifiable interests include interest held on behalf of authorised unit
trust schemes in the U.K., notwithstanding the exemption from reporting pursuant
to Section 209 (1)(h) of the Companies Act 1985.



5. These notifications of disclosable interests constitute separate
notifications of interest in the shares and are combined solely for the purposes
of clarity and efficiency.  Nothing herein should be taken to indicate that FMR
Corp. and its direct and indirect subsidiaries, Fidelity International Limited
and its direct and indirect subsidiaries or Mr. Edward C. Johnson 3d act as a
group or in concert in respect of the disclosed interests, or that they are
required to submit these notifications on a joint basis.



6. The disclosable interests arise under section 208 (4)(b) of the Act, namely
where a person, not being the registered holder, is entitled to exercise a right
conferred by the holding of the shares or to control the exercise of such
rights, or under section 203 of the Act respectively.



                                                               By: Eric D.Roiter

                                                               Senior V.P & General Counsel - FMR Co

                                                               Duly Authorised under Powers of Attorney

                                                               dated December 30, 1997, by and on behalf

                                                               of FMR Corp. and its direct and indirect

                                                               subsidiaries, and Fidelity International

                                                               Limited and its direct and indirect

                                                               subsidiaries.





Schedule A
                            Amendment #7



Security: Marconi Corporation Plc


Ordinary Shares                   Shares Held    Management     Nominee/Registered Name
                                                   Company

                                       72,838       FMRCO       JP Morgan Chase
                                       62,563       FMRCO       State Street Bank & Trust Company
                                      716,231       FMRCO       Chase Nominees Limited
                                   14,110,087       FMRCO       HSBC
                                      364,900       FMRCO       State Street Nominees Ltd
                                       27,880       FMRCO       Citibank
                                    1,177,153       FMRCO       Brown Brothers Harriman
                                       10,460       FMTC        State Street Nominees Ltd
                                        6,840       FMTC        Mellon Bank
                                        4,880       FMTC        State Street Bank & Trust
                                    3,563,732       FISL        Chase Manhattan Bank London
                                       37,164       FISL        Chase Nominees Ltd
                                      185,060        FPM        Chase Nominees Ltd
                                      213,480        FIL        Chase Manhattan Bank London
                                       76,200        FIL        Northern Trust
                                      325,120        FIL        Deutsche Bank
                                       23,780        FIL        JP Morgan
                                      485,000        FIL        Brown Brothers Harriman

Total ordinary shares              21,463,368


Current ownership                     10.732%
percentage:


Shares in issue:                  200,002,000


Change in holdings                  (537,438)
since last filing:            ordinary shares



                      This information is provided by RNS
            The company news service from the London Stock Exchange
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