SOURCE: Spirent PLC

June 20, 2005 05:00 ET

Spirent Plc - Holding(s) in Company

Crawley, UK -- (MARKET WIRE) -- June 20, 2005 --

                                  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

NOT KNOWN

5. Number of shares / amount of stock acquired

N/A

6. Percentage of issued class

N/A

7. Number of shares / amount of stock disposed

NOT KNOWN

8. Percentage of issued class

NOT KNOWN

9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction

NOT NOTIFIED

11. Date company informed

20 MAY 2005

12. Total holding following this notification

28,694,687

13. Total percentage holding of issued class following this notification

2.98%

14. Any additional information

NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE SHAREHOLDER NO LONGER HAS A NOTIFIABLE INTEREST. SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 29,274,400 SHARES (3.04%) ON 05 MAY 2005

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

20 JUNE 2005

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