Holding(s) in Company

Spirent PLC
21 November 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)                             196,866
CHASE NOMINEES LTD (FPM)                                     1,815,596
NORTHERN TRUST (FPM)                                           531,300
CHASE MANHATTAN BANK LONDON (FIL)                              598,058
BANK OF NEW YORK BRUSSELS (FIL)                                210,800
NORTHERN TRUST (FIL)                                           650,000
CHASE NOMINEES LTD (FIL)                                     2,703,613
BANK OF NEW YORK LONDON (FIL)                                  418,366
NORTRUST NOMINEES LTD (FIL)                                    818,000
STATE STREET BANK & TRUST (FIL)                                 77,300
HSBC CLIENT HOLDINGS NOMINEE (UK) LIMITED (FIL)             19,519,043

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


6,109,413



8. Percentage of issued class


0.65%



9. Class of security


ORDINARY SHARES OF 3.3333 PENCE EACH



10. Date of transaction


NOT NOTIFIED



11. Date company informed


20 NOVEMBER 2003



12. Total holding following this notification


27,538,942



13. Total percentage holding of issued class following this notification


2.92%



14. Any additional information


NOTIFICATION PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE SHAREHOLDER NO 
LONGER HAS A NOTIFIABLE INTEREST



15. Name of contact and telephone number for queries


PAUL EARDLEY - 01293 767654



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


PAUL EARDLEY - COMPANY SECRETARY



Date of notification


21 NOVEMBER 2003



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