Holding(s) in Company

Spirent PLC
15 August 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)     425,100

CHASE NOMINEES LTD (FPM)     5,050,096

NORTHERN TRUST (FPM)     1,468,600

CHASE MANHATTAN BANK LONDON (FIL)     1,213,228

BANK OF NEW YORK BRUSSELS (FIL)     588,500

NORTHERN TRUST (FIL)     2,008,900

CHASE NOMINEES LTD (FIL)     7,495,713

BANK OF NEW YORK LONDON (FIL)     1,188,266

NORTRUST NOMINEES LTD (FIL)     2,261,300

STATE STREET BANK & TRUST (FIL)     213,400

HSBC CLIENT HOLDINGS NOMINEE (UK) LIMITED (FIL)     31,464,800

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
11,522,525

8. Percentage of issued class
1.22%

9. Class of security
ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction
NOT NOTIFIED

11. Date company informed
15 AUGUST 2003

12. Total holding following this notification
53,523,982

13. Total percentage holding of issued class following this notification
5.67%

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
15 AUGUST 2003

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for loss of business or loss of profits) arising in contract, tort or otherwise
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