Completion of Disposal

Spirent PLC
15 February 2006


                                  SPIRENT PLC

             COMPLETION OF DISPOSAL OF THE HELLERMANNTYTON DIVISION
                               FOR £288.9 MILLION

London, UK - Wednesday, 15 February 2006: Spirent plc (LSE: SPT; NYSE: SPM), a
leading communications technology company, today announces that it has completed
the sale of its Network Products group, the HellermannTyton division, to funds
controlled by Doughty Hanson & Co Limited, for a consideration of approximately
£288.9 million (at a cash free/debt free equivalent value).

Enquiries

Anders Gustafsson, Chief Executive  Spirent plc              [phone]
Eric Hutchinson, Finance Director

Reg Hoare                           Smithfield               [phone]
Katie Hunt

Tim Shacklock                       Gleacher Shacklock LLP   [phone]
Edward Cumming-Bruce

Julian Cazalet                      JPMorgan Cazenove Ltd    [phone]
Andrew Hodgkin


About Spirent

Spirent 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 plc can be found at www.spirent.com

Spirent 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
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. Such factors include, but are not limited to: the extent to which
customers continue to invest in next-generation technology and deploy advanced
IP-based services; our ability to successfully expand our customer base; our
ability to continue to benefit from generally improving market conditions; the
prevailing market conditions and pace of economic recovery; our ability to
improve efficiency, achieve the benefits of our cost reduction goals and adapt
to economic changes and other changes in demand or market conditions; our
ability to develop and commercialise new products and services, extend our
existing capabilities in IP services and expand our product offering
internationally; our ability to attract and retain qualified personnel; the
effects of competition on our business; fluctuations in exchange rates and heavy
exposure to a weak US dollar; changes in the business, financial condition or
prospects of one or more of our major customers; risks of doing business
internationally; the financial burden of our pension fund deficit; risks
relating to the acquisition or sale of businesses and our subsequent ability to
integrate businesses; our reliance on proprietary technology; our exposure to
liabilities for product defects; our reliance on third party manufacturers and
suppliers; and other risks described from time to time in Spirent plc's
Securities and Exchange Commission periodic reports and filings.

Gleacher Shacklock LLP and JPMorgan Cazenove Limited, who are authorised and
regulated in the United Kingdom by the Financial Services Authority, are acting
exclusively for Spirent plc. Gleacher Shacklock LLP and JPMorgan Cazenove
Limited are not acting for any other person in relation to the disposal and
Gleacher Shacklock LLP and JPMorgan Cazenove Limited will not be responsible to
any person other than Spirent plc for providing the protections afforded to
clients of Gleacher Shacklock LLP and JPMorgan Cazenove Limited or for providing
advice in relation to the contents of this document or the disposal.

                                    - ends-



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