Acquisition

Spirent PLC
23 January 2006


                     SPIRENT PLC: ACQUISITION OF SWISSQUAL

London, UK - 23 January 2006: Spirent plc (LSE: SPT; NYSE: SPM), a leading
communications technology company, today announces that it has entered into an
agreement to acquire SwissQual Holding AG ('SwissQual'), a leading Swiss based
provider of innovative test and measurement solutions for wireless telecoms
markets.

Highlights:

   • Agreement to acquire SwissQual for an initial consideration of CHF62.5
     million (£27.7 million), payable in cash on completion with up to a further
     CHF 28.0 million (£12.4 million) payable depending on revenue growth and 
     various technical and financial milestones.

   • SwissQual brings to Spirent world class products and talent in the
     development of voice and video solutions that analyse, measure and improve
     the quality of experience for users of wireless applications and services.

   • SwissQual will enhance Spirent's wireless market presence principally
     by:

          -  bringing it into a new and growing market - 'Subscriber Experience
             Management' for wireless networks;

          -  enabling Spirent's entry into the video intensive handset
             applications testing market through access to new technology ; and

          -  broadening its geographic coverage and expanding its customer base.

   • SwissQual will be incorporated within the Performance Analysis division
     and its experienced management team will continue to manage the business.

   • The acquisition is expected to be earnings enhancing in Spirent's
     current financial year ended 31 December 2006.

   • The acquisition will be financed from Spirent's cash resources and bank
     facilities.

   • SwissQual is a profitable and fast growing business, reporting EBITA of
     CHF 5.5 million on revenues of CHF 32.1 million in its financial year ended
     31 December 2005, up 38 per cent compared to 2004.

Anders Gustafsson, Chief Executive, commented:

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

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

'SwissQual will broaden our wireless footprint and accelerate our entry into a
new and growing market. It is expected to be earnings enhancing in 2006 and
should provide good organic growth opportunities and deliver synergies with our
existing portfolio of businesses.'

Enquiries

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

Reg Hoare                             Smithfield       [phone]
Katie Hunt

A conference call for analysts will take place at 9.30am today, 23 January 2006.
Participants should call 0845 245 3471 (or [phone] for international
callers). A replay will be available for 7 days by calling the following number:
0845 245 5205, PIN 4054323 # ([phone] for international callers)

   Photography is available from UPPA (Universal Pictorial Press & Agency) -
                      www.uppa.co.uk or tel: [phone]

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.

Acquisition of SwissQual

Spirent plc today announces that it has entered into an agreement to acquire
SwissQual, a leading provider of innovative test and measurement solutions for
wireless telecoms markets, for a total consideration of up to CHF 90.5 million
(£ 40.1 million), on a cash and debt free basis.

SwissQual, a Swiss based company, was founded in 2000, and provides world class
products and talent in the development of voice and video solutions that
analyse, measure and improve the quality of experience for users of wireless
applications and services. SwissQual also has a presence in Italy and Singapore
and employs around 80 staff in total.

SwissQual's broad portfolio of products can be used for:

   • Benchmarking service quality on an operator's and their competitors'
     networks.

   • Delivering detailed information that enables operators to troubleshoot
     and improve wireless service performance.

   • Evaluating the service performance of fixed and wireless network
     equipment in Lab and R&D settings.

In the year ended 31 December 2005, SwissQual reported sales of CHF 32.1 million
(£14.2m) with EBITA of CHF 5.5 million (£2.4 m), up from CHF 23.3 million
(£10.3m) and CHF 4.8 million (£2.1m) in 2004, respectively. Gross assets cash
free were CHF 19.5 million (£8.6 m). In the current financial year ended 31
December 2005, SwissQual made strong progress in growing both sales and
operating profits, and at the same time significantly increasing research and
development and sales and marketing expenditure with a robust return on sales.

The acquisition of SwissQual is expected to increase Spirent's wireless market
position by bringing exposure to a new market area (Subscriber Experience
Management, which measures the quality of the subscriber's experience and
service received from a user perspective rather than a network perspective)
together with access to technology that enables Spirent's entry into the video
intensive handset applications test market. In addition, SwissQual has a high
quality European customer base of wireless network operators and brings with it
a number of organic growth opportunities.

The following synergies exist with Spirent's existing communications activities:

   • Geographic: further expansion of Spirent's wireless activities in Europe
     and other markets.

   • Sales: significant cross selling opportunities in USA and Asia and new
     sales channels.

   • Strategic: provides technology that will enable Spirent to expand its
     wireless product portfolio to address handset application testing.

   • Technology: brings World class leadership and talent in the development
     of voice and video measurement algorithms .

SwissQual will be incorporated within the Performance Analysis division and its
experienced management team will continue to manage the business.

The initial consideration is CHF 62.5 million (£ 27.7 million), payable in cash
on completion. A total further consideration of up to CHF 28.0 million (£ 12.4
million) is payable during 2006 and 2007 based on achievement of certain revenue
targets in 2006 and the delivery of technical milestones.

The acquisition is expected to be earnings enhancing in Spirent's current
financial year ended 31 December 2006 and achieves all of Spirent's other
acquisition hurdle criteria.

                                    - ends -

Enquiries

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

Reg Hoare                             Smithfield       [phone]
Katie Hunt




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