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 07, 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 1934.)

                                   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.

 Telstra selects Marconi as a preferred supplier for next generation photonics
                           and sdh network equipment

  Marconi's Smart Photonix and 10Gbps SDH products to support the evolution of
    Telstra's inter-capital, metropolitan and regional transmission network

London and Melbourne - 7 May 2003 - Marconi (MONI) has been selected as one of
two preferred suppliers of next generation 10G, or Gigabits per second (Gbps),
Dense Wave Division Multiplexer (DWDM) and Synchronous Digital Hierarchy (SDH)
products for the inter-capital, metropolitan and regional networks of Telstra
Corporation in Australia.

Under the frame agreement, Marconi is positioned to supply hardware as well as
commissioning and support services to Telstra when the carrier upgrades its
transmission network to 10Gbps capacity. The upgrade will be scheduled in
accordance with customer and network requirements.

Marconi's next-generation optical and SDH products will allow Telstra to
seamlessly upgrade its existing 2.5Gbps transmission network, which already
includes a large proportion of Marconi technology, in an economic and responsive

Telstra's managing director, Wireline & Wireless, Mr Ken Benson, said: "We have
undertaken a thorough technical and economic evaluation of proposals from a
number international vendors. We are confident that the vendors we have chosen
will enable us to cost efficiently meet the evolving needs of our customers and
maintain our leading industry position."

"The speed and capacity offered by moving to 10Gbps is an important component of
Telstra's plans to provide residential and business customers with high quality
broadband services," Mr Benson said.

Commenting on the signing, Paul Butcher, managing director, Marconi Australia,
said: "We are delighted to be selected as a preferred supplier for our suite of
next-generation DWDM and SDH products to Telstra. This gives us the opportunity
to have a significant impact on how its network provides for its customers'
needs in an increasingly broadband-oriented world."

Marconi's SmartPhotonix and SDH products are in use with more than 100
telecommunications service providers throughout the world, including a number in
Australia and New Zealand.


Note to Editors

Marconi's SmartPhotonix suite offers a range of DWDM products including metro,
point-to-point and core solutions. The solutions are scalable to match dynamic
traffic growth, as well as being flexible and resilient, with the ability to
provide remote provisioning of services. The use of common cards and shared
technology delivers cost savings and network simplification. The products are
all capable of full interworking and have a common management platform, whilst
at the same time providing a modular upgrade path to next generation networking.

Marconi's next generation SDH transmission systems can move data at speeds of up
to 10 Gigabits per second (Gbps) over both copper and fibre optic networks. A
single SDH multiplexer can perform the same task as an older PDH (Plesiochronous
Digital Hierarchy) 'multiplexer mountain', reducing equipment costs and
maintenance overhead. In addition, the 'drop and add' capabilities of SDH
multiplexer equipment allow networks to be easily and flexibly re-reconfigured
to match variations in the traffic level on the network. Marconi's next
generation portfolio offers simple and cost effective migration to multiservice
networks and is designed for evolving networks and flexible provisioning.


About Marconi plc

Marconi plc is a global telecommunications equipment 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 can be found at

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

About Telstra Corporation

Telstra is Australia's leading telecommunications carrier and a world-class
fully integrated, full service provider across wireline, ADSL, HFC, satellite
and digital wireless networks and platforms. Telstra has more than 10 million
household, business and wholesale customers. Telstra is Australia's leading ISP,
has the most highly accessed family of internet portals and sites and provides
entertainment and multimedia content over its broadband network and through its
Pay-TV joint venture Foxtel.

Telstra owns and operates one of the most technologically advanced networks,
offering end-to-end solutions ranging from broadband, IP, mobile and intelligent
network services, to voice and data network hubs, call centres and advanced
multimedia and e-commerce applications. It has business operations in North
America, UK/Europe and the Asia-Pacific region.

A top tier global carrier with total 2001/02 revenue of A$21 billion, Telstra
has one of the best known brands in Australia.


David Beck / Joe Kelly

Public Relations
+44 (0) 207 306 1771
+44 (0) 207 306 1490

Heather Green

Investor Relations
+44 (0) 207 306 1735


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 CORPORATION PLC

                                       By:     ____M Skelly____

                                       Name:   M Skelly
                                       Title:  Company Secretary

7th May 2003