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
                                    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

                                   Yes   No X


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:

                   David Beck, tel: 0207 306 1490; email:

                                                             Investor enquiries:

             Heather Green, tel: 0207 306 1735; email:

                              TRANSMISSION NETWORK

LONDON - May 19, 2003 - Marconi  Corporation plc (London:  MONI) today announces
that  Telecom  Italia has  renewed two frame  contracts  worth an  estimated  50
million Euros (c. GBP36  million) for the supply of high  capacity  transmission
equipment  over the next two years.  The  agreements  will ensure  that  Telecom
Italia  continues  to develop  its  advanced  network  based on next  generation
technologies,  characterized by high standards  transmission speed and security.
This  investment  supports the  continued  deployment  of  innovative  broadband
services to Telecom Italia's customers.

The first frame agreement,  worth up to 40 million Euros (c. GBP29 million),  is
an  extension  of an existing  frame  contract for the supply of a wide range of
Synchronous  Digital Hierarchy (SDH) equipment.  This latest agreement reaffirms
Marconi's position as the main supplier of this technology to Telecom Italia.

The second  contract is worth up to 10 million  Euros (c. GBP7  million)  and is
related  to a frame  contract  signed  in 1999 for the  implementation  of a new
optical  transmission  network  for  Telecom  Italia  based on  Marconi's  dense
wavelength division  multiplexing (DWDM) technology.  This innovative technology
can also operate over  dispersion-shifted  fibre (DSF) and allows Telecom Italia
to quadruple the capacity of its already  installed  fibre,  with the associated
improvement in operating costs.

The new Marconi  DWDM  equipment  will allow  Telecom  Italia to  provision  the
bandwidth for  innovative  broadband  services  necessary to satisfy the growing
demands of Telecom Italia's  residential and business  customers by developing a
more efficient optical fibre backbone network.


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

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.


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