Holding(s) in Company

Spirent PLC
24 October 2003

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

SPIRENT PLC

2. Name of shareholder having a major interest

FIDELITY INTERNATIONAL 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 BOX 2 ABOVE AND ITS DIRECT AND INDIRECT SUBSIDIARIES, BEING 
NON-BENEFICIAL HOLDERS

4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them

CHASE MANHATTAN BANK LONDON (FISL)                                       146,079
HSBC (FPM)                                                               232,800
CHASE NOMINEES LTD (FPM)                                               2,761,396
NORTHERN TRUST (FPM)                                                     807,100
CHASE MANHATTAN BANK LONDON (FIL)                                        802,258
BANK OF NEW YORK BRUSSELS (FIL)                                          322,400
NORTHERN TRUST (FIL)                                                   1,107,700
CHASE NOMINEES LTD (FIL)                                               4,063,613
BANK OF NEW YORK LONDON (FIL)                                            648,066
NORTRUST NOMINEES LTD (FIL)                                            1,236,300
STATE STREET BANK & TRUST (FIL)                                          117,000
HSBC CLIENT HOLDINGS NOMINEE (UK) LIMITED (FIL)                       21,403,643

FISL = Fidelity Investment Services Limited
FPM = Fidelity Pension Management
FIL = Fidelity International Limited

5. Number of shares / amount of stock acquired

-

6. Percentage of issued class

-

7. Number of shares / amount of stock disposed

10,200,057

8. Percentage of issued class

1.08%

9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction

NOT NOTIFIED

11. Date company informed

24 OCTOBER 2003

12. Total holding following this notification

33,648,355

13. Total percentage holding of issued class following this notification

3.57%

14. Any additional information

-

15. Name of contact and telephone number for queries

LUKE THOMAS - 01293 767658

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

LUKE THOMAS - DEPUTY COMPANY SECRETARY

Date of notification

24 OCTOBER 2003



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