FOURTH QUARTER TRADING UPDATE

Spirent Communications PLC 13 December 2007 SPIRENT COMMUNICATIONS PLC FOURTH QUARTER TRADING UPDATE London, UK - 13 December 2007: Spirent Communications plc ("Spirent" or "the Company") (LSE: SPT), a leading communications technology company, today announces a trading update for the quarter ended 31 December 2007. Trading update Based on trading during the fourth quarter to date the Company anticipates that results for the second half year as a whole will be somewhat ahead of expected levels. Financial position The Company continued the buyback of shares, with £39.3 million of cash being returned through share buybacks in the quarter to date, a further purchase of 59.5 million shares by the Company. The preliminary results for the year ending 31 December 2007 are expected to be announced to shareholders on 28 February 2008. - ends - Enquiries Edward Bramson, Executive Chairman Spirent Communications plc +44 (0)1293 767676 Eric Hutchinson, Chief Financial Officer Andrew Dowler/Harriet Keen Financial Dynamics +44 (0)20 7831 3113 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 www.spirent.com. Spirent Communications plc Ordinary shares are traded on the London Stock Exchange (ticker: SPT). The Company operates a Level 1 American Depositary Receipt ("ADR") programme with each ADR representing four Spirent Communications plc Ordinary shares. The ADRs trade in the US over-the-counter ("OTC") market under the symbol SPMYY and the CUSIP number is 84856M209. 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. Cautionary statement This document may contain forward-looking statements which are made in good faith and are 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 document, whether as a result of new information, future events or otherwise. This information is provided by RNS The company news service from the London Stock Exchange
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