Crawley, UK -- (MARKET WIRE) -- December 29, 2006 --


                         BOARD COMPOSITION

London, UK - 29 December 2006: Spirent Communications plc ("Spirent" or "the Company") (LSE: SPT; NYSE: SPM), a leading technology communications company, today announces the following changes to the structure of the Board (all effective from Friday, 22 December 2006) following the outcome of the Extraordinary General Meeting ("EGM") held on Friday, 22 December 2006:

-  Edward Bramson has been elected as Chairman of the Board and appointed
   as Chairman of the Nomination Committee;

-  Ian Brindle has been appointed as a Non-Executive Director and
   Chairman of the Audit Committee. He has also been appointed as a  
   member of the Remuneration Committee and Nomination Committee;

-  Alexander Walker has been appointed as the Senior Independent
   Non-Executive Director and Chairman of the Remuneration Committee. He 
   has also been appointed as a member of the Audit Committee and 
   Nomination Committee; and

-  Gerard Eastman has been appointed as a Non-Executive Director and a
   member of the Audit, Remuneration and Nomination Committees.

The other members of the Board where roles and responsibilities have not changed are as follows:

Anders Gustafsson (Chief Executive Officer and a member of the Nomination Committee), Eric Hutchinson (Chief Financial Officer) and Goran Ennerfelt (Non-Executive Director and a member of the Nomination Committee).

A further announcement will be made in due course in compliance with UK Listing Rule paragraph 9.6.13R (1) to (6) together with any interests in the securities of the Company.

                                - ends -


Paul Eardley    Company Secretary & General Counsel  +44 (0)1293 767676

About Spirent Communications plc

Spirent Communications plc is a leading communications technology company focused on delivering innovative systems and services to meet the needs of customers worldwide. We are a global provider of performance analysis and service assurance solutions that enable the development and deployment of next-generation networking technologies such as broadband services, Internet telephony, 3G wireless and web applications and security testing. The Systems group develops power control systems for specialist electrical vehicles in the mobility and industrial markets. Further information about Spirent Communications plc can be found at

Spirent Communications plc Ordinary shares are traded on the London Stock Exchange (ticker: SPT) and on the New York Stock Exchange (ticker: SPM; CUSIP number: 84856M209) in the form of American Depositary Shares ("ADS"), represented by American Depositary Receipts, with one ADS representing four Ordinary shares.

Spirent and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc. All other trademarks or registered trademarks mentioned herein are held by their respective companies. All rights reserved.

This press release may contain forward-looking statements (as that term is defined in the United States Private Securities Litigation Reform Act of 1995) based on current expectations or beliefs, as well as assumptions about future events. You can sometimes, but not always, identify these statements by the use of a date in the future or such words as "will", "anticipate", "estimate", "expect", "project", "intend", "plan", "should", "may", "assume" and other similar words. By their nature, forward-looking statements are inherently predictive and speculative and involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future. You should not place undue reliance on these forward-looking statements, which are not a guarantee of future performance and are subject to factors that could cause our actual results to differ materially from those expressed or implied by these statements. The Company undertakes no obligation to update any forward-looking statements contained in this press release, whether as a result of new information, future events or otherwise.

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