Strategic Partnership

811 - 18 September 2002

          SPIRENT PLC AND UBINETICS ENTER INTO STRATEGIC PARTNERSHIP           

Spirent plc (LSE: SPT; NYSE: SPM), a leading international network technology
company, and UbiNetics, a leading developer of licensable core technologies and
test equipment for third generation wireless (3G) voice and data applications,
announce that they have entered into a strategic partnership to expand their
test solutions for the 3G market.

Under the terms of the agreement Spirent has acquired UbiNetics' CS100 product
line and rights to associated intellectual property for £6.5 million in cash.
In addition, under the agreement Spirent and UbiNetics will partner for the
further development of the CS100 product line and future test platforms. The
CS100 3G base station emulator product is used by leading mobile phone
manufacturers and chip set developers for the test and verification of wideband
CDMA (WCDMA) user equipment and provides a flexible multi-cell simulation of
the physical layer of a WCDMA network.

The partnership brings significant strategic benefits to both parties.
Spirent's Communications group has already developed a strong global presence
with its test solutions for 3G wireless networks based on CDMA technology and
this relationship will extend Spirent's expertise into WCDMA air interface
testing. UbiNetics is a market leader in the development of WCDMA Test Mobiles
and will benefit from the application of Spirent's data generation and analysis
capabilities and its expertise in the integration of complex wireless test
solutions. As a result of the partnership, both parties will be able to develop
complementary advanced solutions for testing and managing complex WCDMA
infrastructure and user equipment. Current partners and customers will benefit
from increased development efforts, better global reach and greater breadth of
expertise.

Commenting on the partnership Geoff Zeidler, President of Spirent
Communications - Europe and Wireless, said:

'Wideband CDMA technology will enable the deployment of new wireless services
in the majority of the world's markets. I am delighted that this partnership
with UbiNetics will enable Spirent to extend its reputation for delivering
market leading solutions to meet the demanding development requirements of its
wireless customers.'

Bjorn Krylander, Chief Executive of UbiNetics, commented:

'UbiNetics has, by leading the development of WCDMA technology, been able to
supply efficient test solutions to infrastructure suppliers and network
operators. By partnering with Spirent we will be able to create a broader range
of more capable systems for network testing.'

                                   - ends -                                    

Enquiries

Spirent plc

Nicholas Brookes, Chief Executive                        [phone]    
                                                                               
Eric Hutchinson, Finance Director                                              
                                                                               
Geoff Zeidler, President, Spirent                                              
                                                                               
Communications - Europe and                                                    
                                                                               
Wireless                                                                       
                                                                               
Investor Relations                                                             
                                                                               
Catherine Nash                                           [phone]    
                                                                               
Media                                                                          
                                                                               
Jon Coles/Rupert Young            Brunswick (London)     [phone]   
                                                                               
Lauren Teggelaar                  Brunswick (New York)   [phone]       
                                                                               
UbiNetics                                                                      
                                                                               
Bjorn Krylander, Chief Executive                         [phone]    
                                                                               
Stirling Essex, Senior Vice                                                    
President                                                                      
                                                                               
Test and Measurement Products                                                  
                                                                               
Judith Bliss, Media Relations                                                  
                                                                               
Media                                                                          
                                                                               
Kate Axelby                       Lewis PR (London)      [phone]  

About Spirent

Spirent plc is an international network technology company providing
state-of-the-art systems and solutions for a broad range of customers
worldwide. Our Communications group is a worldwide provider of integrated
performance analysis and service assurance systems for next-generation network
technologies. Spirent's solutions accelerate the development and deployment of
network equipment and services by emulating real-world conditions and assuring
end-to-end performance of large-scale networks. Our Network Products group
provides innovative solutions for fastening, identifying, insulating,
organising, routing and connectivity that add value to electrical and
communication networks in a wide range of applications. Our Systems group
offers integrated product solutions for the aerospace, power controls and
environmental markets. Further information about Spirent plc can be found at 
www.spirent.com

Spirent plc is listed on the London Stock Exchange (ticker: SPT) and on the New
York Stock Exchange (ticker: SPM; CUSIP number: 84856M209) with one American
Depositary Receipt representing four Ordinary shares.

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

About UbiNetics

UbiNetics is a next generation wireless communications technology company. It
designs and develops innovative 3G, 2.5G and 2G products and solutions for
wireless data and voice applications and is a leader in 3G test and measurement
equipment.

The company's 3G Test Mobile has become the industry de-facto standard for
WCDMA infrastructure testing. This, together with the portable TM200 Test
Mobile and other test solutions, positions UbiNetics at the centre of 3G
interoperability testing. UbiNetics also provides the industry's most robust
protocol software and physical layer IP portfolio for 3G chipset and handset
developers and manufacturers. The company has developed a unique range of
creative products for UMTS and GPRS/GSM applications including customised
embedded modules and development tools.

The company was formed in January 1999 from PA Consulting Group's Wireless
Telecommunications Practice. Since 1999, UbiNetics has grown to over 400
employees with activities in the UK (Cambridge and Swindon), the US, Japan,
India, Hong Kong and Taiwan.

Further information about UbiNetics can be found at www.UbiNetics.com

This press release may contain forward-looking statements (as that term is
defined in the United States Private Securities Legislation Reform Act 1995)
that are based on current expectations or beliefs, as well as assumptions about
future events. You can identify these statements by their use of words such as
'will,' 'anticipate,' 'estimate,' 'expect,' 'project,' 'intend,' 'plan,'
'should,' 'may,' 'assume' and other similar words. You should not place undue
reliance on our 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: aggressive competition; our ability to develop and
commercialise new products and services and realise product synergies; our
ability to focus on growth areas in the relevant markets; risks relating to the
acquisition or sale of businesses and our subsequent ability to integrate
businesses; our reliance on third party manufacturers and suppliers; our
exposure to liabilities for product defects; our reliance on proprietary
technology; our ability to attract and retain qualified personnel; risks of
doing business internationally; risks of downturns and continued downturns in
the markets in which we participate; and other risks described from time to
time in Spirent plc's Securities and Exchange Commission periodic reports and
filings. We undertake no obligation to update our forward-looking statements,
whether as a result of new information, future events or otherwise.