Holding(s) in Company

Spirent PLC
01 November 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 designation                 Holding

BARCLAYS CAPITAL NOMINEES LIMI                           -                                       754,502
CHASE NOMINEES LTD                                       16376                                   531,812
CHASE NOMINEES LTD                                       20947                                27,953,872
CHASE NOMINEES LTD                                       21359                                 1,176,143
INVESTORS BANK AND TRUST CO                              -                                       434,795
INVESTORS BANK AND TRUST CO                              -                                        11,784
INVESTORS BANK AND TRUST CO                              -                                       298,290
INVESTORS BANK AND TRUST CO                              -                                       111,024
JP MORGAN (BGI CUSTODY)                                  16331                                   244,863
JP MORGAN (BGI CUSTODY)                                  16341                                 1,654,211
JP MORGAN (BGI CUSTODY)                                  16341                                   635,690
JP MORGAN (BGI CUSTODY)                                  16344                                   400,264
JP MORGAN (BGI CUSTODY)                                  16345                                   742,167
JP MORGAN (BGI CUSTODY)                                  16400                                 9,962,821
JP MORGAN (BGI CUSTODY)                                  18409                                   484,895
JP MORGAN CHASE BANK                                     -                                       179,290
JP MORGAN CHASE BANK                                     -                                       409,555
JP MORGAN CHASE BANK                                     -                                       633,980
JP MORGAN CHASE BANK                                     -                                       360,275
R C GREIG NOMINEES LIMITED A/C                           BL1                                     135,530
R C GREIG NOMINEES LIMITED A/C                           CM1                                      32,079
R C GREIG NOMINEES LIMITED GP1                           GP1                                      34,067
R C GREIG NOMINEES LIMITED SA1                           SA1                                      22,152
ZEBAN NOMINEES LIMITED                                   -                                         1,000
                                                         TOTAL                                47,205,061


5. Number of shares / amount of stock acquired

-


6. Percentage of issued class

-


7. Number of shares / amount of stock disposed

NOT NOTIFIED


8. Percentage of issued class

NOT NOTIFIED


9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH


10. Date of transaction

HOLDING AS AT 27 OCTOBER 2004


11. Date company informed

01 NOVEMBER 2004


12. Total holding following this notification

47,205,061


13. Total percentage holding of issued class following this notification

4.94%


14. Any additional information

NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE
SHAREHOLDER NAMED IN 2 ABOVE HAS DECREASED THEIR NOTIFIABLE SHAREHOLDING IN
SPIRENT PLC TO 4.94%.  SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF
54,428,018 SHARES (5.70%) ON 07 OCTOBER 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

01 NOVEMBER 2004


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for loss of business or loss of profits) arising in contract, tort or otherwise
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