Holding(s) in Company

Spirent PLC
25 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                                    804,872
CHASE NOMINEES LTD                             16376              562,967
CHASE NOMINEES LTD                             20947           29,821,307
CHASE NOMINEES LTD                             21359            1,267,026
INVESTORS BANK AND TRUST CO                                       116,208
INVESTORS BANK AND TRUST CO                                       298,290
INVESTORS BANK AND TRUST CO                                       369,757
INVESTORS BANK AND TRUST CO                                        12,766
JP MORGAN (BGI CUSTODY)                        16331              351,468
JP MORGAN (BGI CUSTODY)                        16341            1,453,016
JP MORGAN (BGI CUSTODY)                        16341              550,836
JP MORGAN (BGI CUSTODY)                        16344              473,746
JP MORGAN (BGI CUSTODY)                        16345              820,410
JP MORGAN (BGI CUSTODY)                        16400            9,999,746
JP MORGAN (BGI CUSTODY)                        18409              484,895
JP MORGAN CHASE BANK                                              633,980
JP MORGAN CHASE BANK                                              360,275
JP MORGAN CHASE BANK                                              409,555
JP MORGAN CHASE BANK                                              179,290
R C GREIG NOMINEES LIMITED A/C                  BL1               134,745
R C GREIG NOMINEES LIMITED A/C                  CM1                35,079
R C GREIG NOMINEES LIMITED GP1                  GP1                34,067
R C GREIG NOMINEES LIMITED SA1                  SA1                22,152
ZEBAN NOMINEES LIMITED                                              1,000

                                                TOTAL          49,197,453

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

HOLDING AS AT 23 NOVEMBER 2004

11. Date company informed

25 NOVEMBER 2004

12. Total holding following this notification

49,197,453

13. Total percentage holding of issued class following this notification

5.15%

14. Any additional information

NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE
SHAREHOLDER NAMED IN 2 ABOVE HAS INCREASED THEIR NOTIFIABLE SHAREHOLDING IN
SPIRENT PLC TO 5.15%.  SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF
47,205,061 SHARES (4.94%) ON 01 NOVEMBER 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

25 NOVEMBER 2004

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for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
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