RNS Number:7804T
Spirent PLC
02 January 2004

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


SPIRENT PLC



2. Name of shareholder having a major interest


STANLIFE NOMINEES LIMITED



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


COMPANY NAMED 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


AS NAMED IN 2 ABOVE



5. Number of shares / amount of stock acquired


2,725,000



6. Percentage of issued class


0.29%



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


30 DECEMBER 2003



11. Date company informed


31 DECEMBER 2003



12. Total holding following this notification


29,562,297



13. Total percentage holding of issued class following this notification


3.13%



14. Any additional information


SHAREHOLDER HAS INFORMED THE COMPANY THAT FOLLOWING THE ABOVE-MENTIONED
ACQUISITION OF SHARES, THAT IT NOW HAS THE ABOVE-REPORTED MATERIAL INTEREST IN
THE COMPANY



15. Name of contact and telephone number for queries


MICHAEL ANSCOMBE - 01293 767 672



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


MICHAEL ANSCOMBE - ASSISTANT COMPANY SECRETARY




Date of notification


2 JANUARY 2004



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