Holding(s) in Company

RNS Number:6179U
Marconi Corporation PLC
26 January 2004


The company received the following notification on Friday, 23rd January 2004:


          Legal & General
          Investment Management
          Bucklersbury House
          3 Queen Victoria Street
          London 3C4N 8NH

23 January, 2004



Marconi Corporation
34 Grosvenor Square
London W1K 2HD
Attn: Company Secretary

Disclosure of Interest in Shares Under Section 198


Consequent upon a transfer out of management of 126,400 shares on the 21 January
2004, Legal & General Group Plc companies are now the beneficial owners of the
following number of shares which are not subject to a concert party and will be
registered as follows:


Material Interest


HSBC Global Custody Nominee (UK) Ltd A/C 914945                    73,000

HSBC Global Custody Nominee (UK) Ltd A/C 775245                   847,253

HSBC Global Custody Nominee (UK) Ltd A/C 357206                 4,450,525

HSBC Global Custody Nominee (UK) Ltd A/C 866203                   281,000

HSBC Global Custody Nominee (UK) Ltd A/C 360509                   249,779


                                                                5,901,557  2.94%

Please note that this percentage is based on our understanding that your issued
share capital is 200,400,000 which is the figure quoted by Exshare.


Please address any queries you may have to Julia Stone on 020 7528 6742.


Yours faithfully,

Julia Stone                                           Lee Toms
Authorised Signatory                                  Authorised Signatory

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