SOURCE: Spirent PLC

August 02, 2005 09:17 ET

SPIRENT PLC ANNOUNCES HOLDING(S) IN COMPANY

Crawley, UK -- (MARKET WIRE) -- August 2, 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

02 AUGUST 2005

12. Total holding following this notification

37,052,198

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)

3.84%

14. Any additional information

SHAREHOLDER PREVIOUSLY REPORTED THAT IT HAD A HOLDING OF 39,137,860 
SHARES (4.06%) IN THE COMPANY ON 01 JUNE 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

02 AUGUST 2005

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