Holding(s) in Company

Spirent PLC
28 October 2004

                                  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

BANK OF NEW YORK BRUSSELS (FIL)                                          81,600
BANK OF NEW YORK LONDON (FIL)                                           264,500
CHASE MANHATTAN BANK LONDON (FIL)                                       776,049
DEUTSCHE BANK (FIL)                                                  54,825,446
JP MORGAN (FIL)                                                         161,117
MELLON BANK (FIL)                                                        37,500
MORGAN STANLEY (FIL)                                                    120,900
NORTHERN TRUST (FIL)                                                    366,974
NORTRUST NOMINEES LTD (FIL)                                             251,300
STATE STREET BANK & TRUST (FIL)                                          16,200
STATE STREET NOMINESS LTD (FIL)                                          94,900
JP MORGAN (FISL)                                                        196,866
BANK OF NEW YORK LONDON (FPM)                                           100,200
CITIBANK (FPM)                                                           91,300
HSBC (FPM)                                                               68,810

TOTAL                                                                57,453,662

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


5. Number of shares / amount of stock acquired

8,408,234


6. Percentage of issued class

0.88%


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

27 OCTOBER 2004


12. Total holding following this notification

57,453,662


13. Total percentage holding of issued class following this notification

6.02%


14. Any additional information

SHAREHOLDER NAMED IN BOX 2 ABOVE PREVIOUSLY REPORTED A NOTIFIABLE INTEREST OF 
5.14% IN THE ISSUED SHARE CAPITAL OF THE COMPANY ON 15 OCTOBER 2004


15. Name of contact and telephone number for queries

MICHAEL ANSCOMBE - 01293 767676


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

MICHAEL ANSCOMBE - ASSISTANT COMPANY SECRETARY


Date of notification

28 OCTOBER 2004


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