RNS Number:7228T
Marconi Corporation PLC
30 December 2003


Goldman Sachs International
Peterborough Court
133 Fleet Street
London
EC4A 2BB

Direct Line 020 7774 1000

29 December 2003


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


Dear Sir / Madam,

UK Companies Act 1985 - Section 198-203 - Marconi Corporation Plc

This notification relates to issued ordinary shares in the capital of Company ("
shares") and is given to fulfilment of the obligations imposed by sections 198
to 203 of the Companies Act 1985 (the "Act").

It has come to our attention that following the capital restructure at close of
business on 23 December 2003, The Goldman Sachs Group Inc., of 85 Broad Street,
New York, NY1004, USA was interested in 14,069,538 shares.

Of these 14,069,538 shares,

a)   The interest in 8,002,485 shares arose from the interest held by Goldman
     Sachs & Co acting as custodian.  These shares are, or will be, registered 
     in the name of Goldman Sachs Securities (Nominees), Limited.

b)   The interest in 8,662 shares arose from the interest held by Goldman
     Sachs & Co., acting as custodian of 4,331 American Depositary Receipts 
     ("ADRs"). These ADRs are, or will be, held at the Depositary Trust Company 
     of New York.

c)   The interest in 6,058,329 shares arose from a beneficial interest held by 
     Goldman Sachs International.  These shares are, or will be, registered at
     CREST in account CREPTEMP.

A copy of this fax is being sent to you by post.  Please do not hesitate to
contact me should you have any questions.

Yours faithfully,

For and on behalf of
The Goldman Sachs Group, Inc.


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