Holding(s) in Company

Spirent PLC
04 March 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


NORTHERN TRUST LONDON (FIL)                 119,150
JP MORGAN BOURNEMOUTH (FISL)                958,076
BANK OF NEW YORK BRUSSELS (FPM)           1,615,200
BANKERS TRUST LONDON (FPM)                  567,500
CITIBANK LONDON (FPM)                       527,200
CLYDESBANK BANK PLC (FPM)                   126,200
JP MORGAN BOURNEMOUTH (FPM)               1,212,417
MELLON BANK (FPM)                         1,116,600
MIDLAND SECURITIES SERVICES (FPM)           285,500
NORTHERN TRUST LONDON (FPM)               2,459,400
STATE STR BK AND TR CO LNDN (FPM)           727,400
TOTAL                                     9,714,643



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



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


UNKNOWN



8. Percentage of issued class


UNKNOWN



9. Class of security


ORDINARY SHARES OF 3.3333 PENCE EACH



10. Date of transaction


NOT NOTIFIED



11. Date company informed


04 MARCH 2005



12. Total holding following this notification


9,714,643



13. Total percentage holding of issued class following this notification


1.01%



14. Any additional information


NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE 
SHAREHOLDER NO LONGER HAS A NOTIFIABLE INTEREST. THE SHAREHOLDER HAD 
PREVIOUSLY REPORTED TO THE COMPANY ON 2 FEBRUARY 2005 THAT IT HELD A 
NOTIFIABLE INTEREST OF 67,158,962 ORDINARY SHARES (7% OF THE 
CONPANY'S ISSUED SHARE CAPITAL).



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


04 MARCH 2005



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