Holding(s) in Company

Spirent PLC
30 October 2003

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company



Spirent plc



2. Name of shareholder having a major interest


Prudential 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


MGIM A/C JPM A/C RU                                  8,533,987
PRUCLT HSBC GIS NOM (UK) PAC AC                     20,054,300
PRUCLT HSBC GIS NOM (UK) PPL AC                        280,000
Total:                                              28,868,287



5. Number of shares / amount of stock acquired


Not known




6. Percentage of issued class


Not known




7. Number of shares / amount of stock disposed


Not applicable




8. Percentage of issued class


Not applicable




9. Class of security


Ordinary Shares of 3.33333 pence each



10. Date of transaction


29 October 2003




11. Date company informed


29 October 2003




12. Total holding following this notification


28,868,287



13. Total percentage holding of issued class following this notification


3.06%



14. Any additional information


Notification in accordance with Part IV of the Companies ACT 1985 (as amended)



15. Name of contact and telephone number for queries


Warren Nash, Spirent plc [phone]




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


Warren Nash, Spirent plc




Date of notification


30 October 2003



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