SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 6-K


                            Report of Foreign Issuer

                      Pursuant to Rule 13a-16 or 15d-16 of
                       the Securities Exchange Act of 1934


                          For the Month of May 19 2003

                         Commission file number: 0-30924


                                   MARCONI PLC

             (Exact name of Registrant as specified in its Charter)


                                   4th Floor
                                 Regents Place
                                338 Euston Road
                                    London
                                    NW1 3BT
                    (Address of principal executive offices)


(Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.)


                             Form 20-F X   Form 40-F


(Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange
Act of 1934.)


                                   Yes   No X


              CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS


In order to utilize the "Safe Harbor"  provisions  of the United States  Private
Securities  Litigation Reform Act of 1995 (the "Reform Act"),  Marconi plc ( the
"Company")  is  providing  the  following  cautionary   statement.   Except  for
historical information contained herein,  statements contained in this Report on
Form 6-K may constitute  "forward-looking  statements" within the meaning of the
Reform Act. The words "believe",  "anticipate",  "expect", "intend", "estimate",
"plan",  "assume",  "positioned",   "will",  "may",  "risk"  and  other  similar
expressions which are predictions of or indicate future events and future trends
which do not relate to historical matters identify  forward-looking  statements.
Reliance should not be placed on such statements  because they involve known and
unknown  risks,  uncertainties  and other factors which are in some cases beyond
the control of the Company,  together with its subsidiaries  (the "Group"),  and
may cause the actual results, performance or achievements of the Group to differ
materially  from  anticipated   future  results,   performance  or  achievements
expressed or implied by such forward-looking  statements (and from past results,
performance or  achievement).  Certain  factors that may cause such  differences
include  but are not  limited  to the  following:  (1) any major  disruption  in
production  at our key  facilities;  (2) changes in the  environmental,  tax and
other laws and regulations,  which, among other things,  could cause us to incur
substantial additional capital expenditures and operation and maintenance costs;
and (3) adverse  changes in the markets for our products,  including as a result
of increased  competition in the highly  competitive  international  markets for
such products. These and other risks, uncertainties and factors are discussed in
the  Company's  Registration  Statement  on Form F-1 and other  filings with the
Securities and Exchange  Commission,  including this Form 6-K.  Shareholders and
prospective  investors  are  cautioned  not to  place  undue  reliance  on these
forward-looking  statements which speak only as to the Company's  judgment as of
the date hereof.  Any such  forward-looking  statements are not intended to give
any  assurance as to future  results.  The Company  undertakes  no obligation to
publicly update or revise any of these  forward-looking  statements,  whether to
reflect new information or future events or circumstances or otherwise.





                                                                Press enquiries:

                    Joe Kelly,  tel: 0207 306 1771; email: joe.kelly@marconi.com

                   David Beck, tel: 0207 306 1490; email: david.beck@marconi.com

                                                             Investor enquiries:

             Heather Green, tel: 0207 306 1735; email: heather.green@marconi.com


    MARCONI CORPORATION SHARES, NEW NOTES AND WARRANTS DEBUT ON LONDON STOCK
                                   EXCHANGE;
                                  CEO COMMENTS


LONDON - May 19, 2003 - Marconi Corporation plc (London: MONI) confirms that the
schemes of arrangement for Marconi Corporation plc and Marconi plc became
effective earlier today. Trading in Marconi Corporation plc's shares, notes and
warrants has begun on the London Stock Exchange this morning following the
successful completion of the company's financial restructuring. Under the terms
of the restructuring GBP340 million of cash, an aggregate of GBP756 million
(sterling equivalent) of senior and junior notes and 995 million shares in
Marconi Corporation plc are being distributed to scheme creditors.

"Today is a very significant day for Marconi and for everyone associated with
our company," said Mike Parton, CEO of Marconi Corporation plc. "By supporting
us over the recent, often difficult period, our customers, staff, suppliers and
new shareholders have contributed to our reaching this important milestone. Our
emergence today with a significantly improved financial position, substantial
improvements in operating performance and a sharper strategic focus on
telecommunications equipment and services allows us to look to the future with
greater confidence and optimism."

Marconi Corporation plc will shortly be writing to shareholders of Marconi plc,
whose details were on the register of members at the close of business on Friday
16 May, to confirm their holdings of shares and, if applicable, warrants in
Marconi Corporation plc.

As previously announced on 14 March 2003, and following the completion of the
Group's financial restructuring, the appointments of Kathleen Flaherty and Ian
Clubb as non-executive directors of Marconi Corporation plc have taken effect.

Ian Clubb will chair Marconi Corporation plc's remuneration committee. Marconi
Corporation plc can confirm that, having included disclosures in its prospectus
dated 31 March 2003, there are no further details to be disclosed in respect of
the newly appointed directors pursuant to paragraph 16.4 of the Listing Rules.

ENDS/...

Notes to Editors

About Marconi Corporation plc

Marconi Corporation plc is a global telecommunications equipment, services and
solutions company. The company's core business is the provision of innovative
and reliable optical networks, broadband routing and switching and broadband
access technologies and services. The company's customer base includes many of
the world's largest telecommunications operators.

The company is listed on the London Stock Exchange under the symbol MONI.

Additional information about Marconi Corporation can be found at
www.marconi.com.

Copyright (c) 2003 Marconi Corporation plc. All rights reserved. All brands or
product names are trademarks of their respective holders.

This press release contains forward-looking statements with respect to products,
partners, customers, future growth and other matters. Please refer to the Form
20-F report and Form 6-K reports filed by Marconi Corporation plc with the
United States Securities and Exchange Commission for a discussion of risks that
could cause actual results to differ materially from such statements.


                                   SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.


                                       MARCONI PLC



                                       By:     ____M Skelly____

                                       Name:   M Skelly
                                       Title:  Company Secretary


Date: 19 May 2003