Disposal

1 May 2002

                                  Spirent plc                                  

                  SALE of Switching Systems international inc                  

Spirent plc, the international network technology company, announces that it
has sold the business and certain assets of Switching Systems International
Inc, a company within its Systems group, for a consideration of up to $9.1
million (approximately £6.3 million) in cash.

For the year ended 31 December 2001, the business being sold had an unaudited
operating loss (before amortisation of goodwill) of $3.4 million (approximately
£2.3 million). The business has a carrying value in the accounts of Spirent plc
of approximately £11.7 million and its sale will result in an associated
goodwill write back of £10.2 million. The sale will be reported in Spirent
plc's accounts for the year ended 31 December 2002 as a non-operating
exceptional item.

This sale represents a further step in the Company's strategy of focusing on
network technology activities.

                                   - ends -                                    

Enquiries:

Nicholas Brookes, Chief Executive Spirent plc [phone]

Eric Hutchinson, Finance Director

Investor Relations

Catherine Nash Spirent plc [phone]

Media

Jon Coles/Rupert Young Brunswick (London) [phone]

Lauren Teggelaar Brunswick (New York) [phone]

Background note:

About Spirent

Spirent plc is an international network technology company providing
state-of-the-art solutions with a focus on high growth activities. Our
Communications group unites leading edge performance analysis technology with
network operations expertise, enabling customers to accelerate the development,
deployment and assurance of next generation network equipment and services
worldwide. 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 rights
reserved.

This press release may contain forward-looking statements 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,'
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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 commercialize new
products and services; risks relating to the acquisition or sale of businesses;
our reliance on third party manufacturers and suppliers; our exposure to
liabilities for product defects; our reliance on proprietary technology; our
ability to grow in e-commerce; our ability to attract and retain qualified
personnel; risks of doing business internationally; and risks of downturns in
the industries 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.