Holding(s) in Company

Spirent PLC
21 October 2003

                                  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 Desig                         No of Shares

ALMLUFTTL-18409-CHASE MANHATTA                                     ALMLUFTT                               475,880
                                                                   
ASTEXMTTL-21359-CHASE NOMINEES                                     ASTEXMTT                               953,690
                                                                   
ASUKEXTTL-20947-CHASE MANHATTA                                     ASUKEXTT                            18,534,178
                                                                   
BARCLAYS CAPITAL NOMINEES LIMI                                                                            738,302

BARCLAYS TRUST CO AS EXEC/ADM                                      BLENTFUK                                   713
                                                                   
BLENTFUKQ-16344-CHASE MANHATTA                                     BLENTPUK                               113,162
                                                                   
BLENTPUKQ-16345-CHASE MANHATTA                                     BLEOFDUK                               276,391
                                                                   
BLEQFDUKQ-16331-CHASE MANHATTA                                     BLEOPTUE                               246,435
                                                                   
BLEQPTUEA-16341-CHASE MANHATTA                                     BLEOPTUK                             1,146,511
                                                                   
BLEQPTUKQ-16341-CHASE MANHATTA                                     BLUKINTT                               585,669
                                                                   
BLUKINTTL-16400-CHASE MANHATTA                                     527191                               8,344,640
                                                                   
CHASE MANHATTAN BANK                                               536747                               3,216,781
                                                                   
CHASE MANHATTAN BANK                                               552942                                 678,395
                                                                   
CHASE MANHATTAN BANK                                               CHATRKTT                               602,072
                                                                   
CHATRKTTL-16376-CHASE MANHATTA                                     573039                                 475,611
                                                                   
INVESTORS BANK AND TRUST CO.                                       585934                                  81,648
                                                                   
INVESTORS BANK AND TRUST CO.                                       595966                                   5,892
                                                                   
INVESTORS BANK AND TRUST CO.                                       601389                                 372,351
                                                                   
INVESTORS BANK AND TRUST CO.                                       540186                                  16,891
                                                                   
JPMORGAN CHASE BANK                                                581610                                 219,070
                                                                   
NORTHERN TRUST BANK - BGI SEPA                                     584069                                 329,081
                                                                   
NORTHERN TRUST BANK - BGI SEPA                                     583996                                 141,650
                                                                   
UBS LIMITED                                                                                               446,293

ZEBAN NOMINEES LIMITED                                                                                      4,780
                                                                   

                                                                   TOTAL                               38,006,086






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
16 October 2003

11. Date company informed
21 October 2003

12. Total holding following this notification
38,006,086

13. Total percentage holding of issued class following this notification
4.03%

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
4.03%. Shareholder previously reported a shareholding of 28,604,635 shares
(3.03%) on 21 August 2003.

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
21 October 2003

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