SOURCE: Spirent PLC

June 01, 2005 10:17 ET

SPIRENT PLC ANNOUNCES SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES

Crawley, UK -- (MARKET WIRE) -- June 1, 2005 --

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


SPIRENT PLC



2. Name of shareholder having a major interest


VIDACOS NOMINEES



3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18


SHAREHOLDER IN 2 ABOVE



4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


SHAREHOLDER IN 2 ABOVE



5. Number of shares / amount of stock acquired


664,633



6. Percentage of issued class


0.069%





7. Number of shares / amount of stock disposed


N/A



8. Percentage of issued class


N/A



9. Class of security


ORDINARY SHARES OF 3.3333 PENCE EACH



10. Date of transaction


1 JUNE 2005



11. Date company informed


1 JUNE 2005





12. Total holding following this notification


39,137,860



13. Total percentage holding of issued class following this notification


4.063%



14. Any additional information


-



15. Name of contact and telephone number for queries


MICHAEL ANSCOMBE - 01293 767672



16. Name and signature of authorised company official responsible for making
this notification


MICHAEL ANSCOMBE - ASSISTANT COMPANY SECRETARY



Date of notification


1 JUNE 2005



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