RNS Number:6429P
Marconi Corporation PLC
11 September 2003

The company received the following notification yesterday:




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

       10 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 3280069



This notification supersedes our previous notification to you dated 03 September
2003 and is prompted by the transfer of shares from the ordinary 5p line (Sedol
3280069) to the ordinary 25p line (Sedol 3335442).



This notification relates to issued ordinary shares of 5p 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        Morley Fund Management Limited no longer have a notifiable
           interest in the shares.





2.         Notification on behalf of Aviva plc.



2.1        Aviva plc no longer have a notifiable interest in the shares.





Yours faithfully,



Abby Condick
For and on behalf of
Aviva plc




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


       10 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 is prompted by the transfer of shares from the ordinary 5p
line (Sedol 3280069) to the ordinary 25p line (Sedol 3335442).



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 
           10,197,000 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 10,197,000 shares giving the Aviva group a total 
           percentage interest in the shares of 5.09%.



2.2        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: 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,



Abby Condrick
For and on behalf of
Aviva plc





The Company Secretary                                         10 September 2003
Marconi Corporation plc



APPENDIX: MORLEY FUND MANAGEMENT LIMITED



REGISTERED HOLDERS                          NUMBER OF SHARES HELD



BNY Norwich Union Nominees Ltd              3,110,396 (Material)
Chase GA Group Nominees Ltd                 5,035,521 (Material)
CUIM Nominee Ltd                            2,051,083 (Material)



TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED: 5.09%

ISSUE SHARE CAPITAL ON WHICH THIS NOFIICATION IS BASED : 200,400,000






The Company Secretary                                         10 September 2003
Marconi Corporation plc

APPENDIX: AVIVA PLC

REGISTERED HOLDERS                          NUMBER OF SHARES HELD



BNY Norwich Union Nominees Ltd              3,110,396 (Material)

Chase GA Group Nominees Ltd                 5,035,521 (Material)

CUIM Nominee Ltd                            2,051,083 (Material)



TOTAL PERCENTAGE INTEREST OF AVIVA PLC : 5.09%

ISSUE SHARE CAPITAL ON WHICH THIS NOFIICATION IS BASED : 200,400,000






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