SOURCE: Spirent PLC

March 31, 2005 06:33 ET

SPIRENT PLC ANNOUNCES HOLDING(S) IN COMPANY

Crawley, UK -- (MARKET WIRE) -- March 31, 2005 --

                        SCHEDULE 10

        NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

SPIRENT PLC

2. Name of shareholder having a major interest

DEUTSCHE BANK AG

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

UNKNOWN

6. Percentage of issued class

UNKNOWN

7. Number of shares / amount of stock disposed

-

8. Percentage of issued class

-

9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction

NOT NOTIFIED

11. Date company informed

30 MARCH 2005

12. Total holding following this notification

32,041,235

13. Total percentage holding of issued class following this notification

3.33%

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

31 MARCH 2005

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