RNS Number:3357P
Marconi Corporation PLC
03 September 2003


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

2 September 2003


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


Dear Sir/Madam,

UK Companies Act 1985 - Sections 198-203 - Marconi Corp Plc (the "Company")

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



It has come to our attention that at close of business on 29 August 2003, The
Goldman Sachs Group, Inc., of 85 Broad Street, New York, NY 10004, USA, was
interested in 85,644,037 shares.



Of these 85,644,037 shares



a)                  The interest in 67,100,830 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 2,727,990 shares arose from the interest
held by Goldman, Sachs International, acting as custodian of 272,799 American
Depositary Receipts ("ADRs").  These ADRs are, or will be, held at the
Depositary Trust Company in New York.



c)                  The interest in 275,000 shares arose from the interest held
by Goldman Sachs International, a direct subsidiary of GS Inc., acting as
custodian of 27,500 ADRs.  These ADRs are, or will be, held at the Depositary
Trust Company of New York.



d)                  The interest in 15,540,217 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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