Holding(s) in Company

Spirent PLC
13 February 2004

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


SPIRENT PLC



2. Name of shareholder having a major interest


BARCLAYS PLC



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


SHAREHOLDER NAMED IN 2 ABOVE



4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


Registered Holder                     Account           Holding
                                      designation


ALMLUFTTL-18409-CHASE MANHATTA        ALMLUFTT          487,521

ASTEXMTTL-21359-CHASE NOMINEES        ASTEXMTT        1,220,660

ASUKEXTTL-20947-CHASE MANHATTA        ASUKEXTT       36,122,576

BARCLAYS CAPITAL NOMINEES LIMI                          734,302

BARCLAYS TRUST CO AS EXEC/ADM                             1,128

BLENTFUKQ-16344-CHASE MANHATTA        BLENTFUK          279,176

BLENTPUKQ-16345-CHASE MANHATTA        BLENTPUK          532,050

BLEQFDUKQ-16331-CHASE MANHATTA        BLEQFDUK          246,435

BLEQPTUEA-16341-CHASE MANHATTA        BLEQPTUE        1,610,786

BLEQPTUKQ-16341-CHASE MANHATTA        BLEQPTUK          650,710

BLUKINTTL-16400-CHASE MANHATTA        BLUKINTT        8,433,668

CHATRKTTL-16376-CHASE MANHATTA        CHATRKTT          475,611

INVESTORS BANK AND TRUST CO.          527191          3,056,084

INVESTORS BANK AND TRUST CO.          536747            756,438

INVESTORS BANK AND TRUST CO.          552942            402,745

INVESTORS BANK AND TRUST CO.          573039             92,016

INVESTORS BANK AND TRUST CO.          585934              9,820

INVESTORS BANK AND TRUST CO.          595966            230,692

JPMORGAN CHASE BANK                   540186            181,647

JPMORGAN CHASE BANK                   BTGF01IE          341,021

JPMORGAN CHASE BANK                   BTGF05IE          381,288

NORTHERN TRUST BANK - BGI SEPA        581610            274,022

NORTHERN TRUST BANK - BGI SEPA        584069            116,930

NORTHERN TRUST BANK - BGI SEPA        604162             41,732

R C GREIG NOMINEES LIMITED A/C        BL1               161,919

R C GREIG NOMINEES LIMITED A/C        CM1                40,458

R C GREIG NOMINEES LIMITED GP1        GP1                15,218

R C GREIG NOMINEES LIMITED SA1        SA1                18,461

UBS LIMITED                           583996            446,293

ZEBAN NOMINEES LIMITED                                    4,780

                                   TOTAL             57,366,187




5. Number of shares / amount of stock acquired


NOT NOTIFIED



6. Percentage of issued class


NOT NOTIFIED



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


13 FEBRUARY 2004



12. Total holding following this notification


57,366,187



13. Total percentage holding of issued class following this notification


6.05%



14. Any additional information


NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE 
SHAREHOLDER NAMED IN 2 ABOVE HAS INCREASED THEIR SHAREHOLDING IN SPIRENT PLC 
TO 6.05%.  SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 47,457,381 SHARES 
(5.01%) ON 2 FEBRUARY 2004.



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


13 FEBRUARY 2004



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