Notice of Results

Spirent PLC
08 July 2004

                                                               831 - 8 July 2004



                                  SPIRENT PLC



                        NOTIFICATION OF INTERIM RESULTS



Spirent plc (LSE: SPT; NYSE: SPM), a leading communications technology company,
announces that it intends to release its interim results for the first half of
2004 on Thursday 5 August 2004 before the opening of the UK market.

The Company will host a results presentation at 09.00 UK time on Thursday 5
August 2004, a webcast of which will be available on the Spirent plc website at
www.spirent.com/investors from 15.00 UK time on that day.

An analysts conference call will also be held at 16.00 UK time/11.00 EDT on that
day.



                                    - ends -



Enquiries

Investor Relations
Catherine Nash                 Spirent plc           [phone]

Media
Jon Coles/Rupert Young         Brunswick             [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.  Our 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 comprises PG Drives
Technology, which develops power control systems for specialist electrical
vehicles in the mobility and industrial markets, and an aerospace business that
provides ground-based logistics support software systems for the aviation
market.  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 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.  By
their nature, forward-looking statements are inherently predictive, 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.  These risks include the risks described from time to time in
Spirent plc's Securities and Exchange Commission periodic reports and filings.
The Company undertakes no obligation to update any forward-looking statements
contained in this press release, whether as a result of new information, future
events or otherwise.



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            The company news service from the London Stock Exchange