Holding(s) in Company

Spirent PLC
27 September 2005

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of listed company


SPIRENT PLC



2. Name of shareholder with a major interest


VIDACOS NOMINEES



3. Please state whether notification indicates that regarding the holding of the
shareholder named in 2 above; 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


-



6. Percentage of issued class (any treasury shares held by the listed company
should not be taken into account when calculating percentage)


-



7. Number of shares / amount of stock disposed


UNKNOWN



8. Percentage of issued class (any treasury shares held by the listed company
should not be taken into account when calculating percentage)


UNKNOWN



9. Class of security


ORDINARY SHARES OF 3.3333 PENCE EACH



10. Date of transaction


NOT NOTIFIED



11. Date company informed


27 SEPTEMBER 2005



12. Total holding following this notification


28,301,510



13. Total percentage holding of issued class following this notification (any
treasury shares held by the listed company should not be taken into account when
calculating percentage)


2.93%



14. Any additional information


SHAREHOLDER NO LONGER HAS A REPORTABLE HOLDING IN THE COMPANY.  SHAREHOLDER 
PREVIOUSLY REPORTED THAT IT HAD A HOLDING OF 37,052,198 SHARES (3.84%) IN THE 
COMPANY ON 02 AUGUST 2005.



15. Name of contact and telephone number for queries


LUKE THOMAS - 01293 767658



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


LUKE THOMAS - DEPUTY COMPANY SECRETARY



Date of notification


27 SEPTEMBER 2005






                      This information is provided by RNS
            The company news service from the London Stock Exchange