Holding(s) in Company

Spirent PLC
21 August 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.          Shares



ALMLUFTTL-18409-CHASE MANHATTA                ALMLUFTT                525,632

ASTEXMTTL-21359-CHASE NOMINEES                ASTEXMTT                 97,866

ASUKEXTTL-20947-CHASE MANHATTA                ASUKEXTT             12,070,648

BARCLAYS CAPITAL NOMINEES LTD                                         814,602

BARCLAYS TRUST CO AS EXEC/ADM                                              98

BLEQFDUKQ-16331-CHASE MANHATTA BLEOFDUK                               368,842

BLEQPTUEA-16341-CHASE MANHATTA                BLEOPTUE              1,360,264

BLEQPTUKQ-16341-CHASE MANHATTA                BLEOPTUK                856,136

BLINTNUKQ-Z1AJ-DUMMY                          BLINTNUK                 48,688

BLUKINTTL-16400-CHASE MANHATTA                BLUKINTT              8,607,324

CHASE MANHATTAN BANK                          527191                1,669,722

CHASE MANHATTAN BANK                          536747                  358,961

CHASE MANHATTAN BANK                          552942                  376,850

CHATRKTTL-16376-CHASE MANHATTA                CHATRKTT                465,794

INVESTORS BANK AND TRUST CO.                  573039                   75,600

INVESTORS BANK AND TRUST CO.                  585934                    4,910

INVESTORS BANK AND TRUST CO.                  595966                  192,819

JPMORGAN CHASE BANK                           540186                  102,598

NORTHERN TRUST BANK - BGI SEPA                581610                   91,803 

NORTHERN TRUST BANK - BGI SEPA                584069                   63,560

UBS LIMITED                                   583996                  446,293

ZEBAN NOMINEES LIMITED                                                  5,625



TOTAL                                                              28,604,635


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


21 August 2003



12. Total holding following this notification


28,604,635



13. Total percentage holding of issued class following this notification


3.03%



14. Any additional information


-



15. Name of contact and telephone number for queries


Michael Anscombe - 01293 767672



16. Name and signature of authorised company official responsible for making
this notification


Michael Anscombe, Assistant Company Secretary



Date of notification


21 August 2003



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