Acquisition

Spirent PLC
13 February 2006


                                  SPIRENT PLC

                      ACQUISITION OF QUADTEX SYSTEMS, INC

London, UK - 13 February 2006: Spirent plc (LSE: SPT; NYSE: SPM), a leading
communications technology company, today announces that it has acquired QuadTex
Systems, Inc ('QuadTex'), a fast growing US based provider of innovative and
leading test tools for internet protocol multimedia subsystem ('IMS') and voice
over IP ('VoIP') testing.

Spirent is paying an initial consideration of US$7.5 million (£4.2 million),
payable in cash on completion with up to a further US$1.5 million (£0.9 million)
payable depending on certain technical milestones and the retention of key
employees.

In addition to being an excellent strategic fit with Spirent's existing
businesses, QuadTex will enhance and be a key contributor to its solutions for
triple play, VoIP and IMS testing. IMS, which is being driven by fixed mobile
convergence ('FMC'), requires comprehensive and flexible protocol testing tools.
Unlike existing tools, QuadTex provides highly flexible and easy to use protocol
test systems allowing users to test the functionality and interoperability of
IMS systems. The need for testing new protocols or modified versions of existing
protocols for FMC and IMS deployment is a market that Spirent has identified as
a key area of focus.

The acquisition is in line with Spirent's stated strategy to make selective
acquisitions as it focuses on its communications activities following the
recently proposed disposal of HellermannTyton. Synergies are expected to be
generated through cross-selling, the integration of products to provide
compelling solutions, and through the further broadening and deepening of
customer relationships.

QuadTex, which has grown rapidly since being founded in 2002, is based in
Dallas, Texas and employs 14 people. It also has a development office in China.
Shipment of its products began in the second half of 2004 and sales in 2005
totalled US$2.0 million with rapid growth expected in 2006. The business was
cash positive and also traded profitably in 2005. Customers include Cisco,
Ericsson, NTT and AT&T with revenues earned principally in the USA, with a
contribution from both Asia and Europe. The founders are expected to continue to
manage the business which will be incorporated within Spirent's Performance
Analysis division.

Anders Gustafsson, Chief Executive, commented:

'Spirent's transformation continues with the acquisition of QuadTex now
following the recent acquisition of SwissQual and the announcement of the
proposed disposal of HellermannTyton.

'The acquisition is in line with our strategy to expand our communications
business, drive profitable growth and deliver shareholder value.'

                                    - ends -

Enquiries

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

Reg Hoare                             Smithfield       [phone]
Katie Hunt

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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 Network Products business is a developer and
manufacturer of innovative solutions for fastening, identification, protection
and connectivity in electrical and communications networks marketed under the
global brand HellermannTyton. 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)
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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.



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