Holding(s) in Company

Spirent PLC
14 April 2003


                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

Spirent plc

2. Name of shareholder having a major interest

Morgan Stanley Securities 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

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

Morgan Stanley Securities Limited      35,579,131

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

10. Date of transaction

Unknown


11. Date company informed

11 April 2003

12. Total holding following this notification

35,579,131

13. Total percentage holding of issued class following this notification

3.77%

14. Any additional information

Notification in accordance with S.198 Companies Act 1985 (as amended)

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

14 April 2003

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