Holding(s) in Company

Spirent PLC
10 February 2003

London Stock Exchange

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES




All relevant boxes should be completed in block capital letters

1    Name of company                                             2    Name of shareholder having a major interest


     SPIRENT plc                                                      AVIVA plc


3    Please state whether notification indicates that it is in   4    Name of the registered holder(s) and, if more
                                                                      than one holder, the number of shares held by
     respect of holding of the shareholder named in 2 above or        each of them
     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 IN 2 ABOVE

                                                                      -
5    Number of shares 6   Percentage of     7   Number of shares 8    Percentage of Issued
     / amount of          Issued                /amount of stock
     stock acquired                             disposed              Class
                          Class
     -                                          7,269,643             0.77%
                          -



9     Class of security                                     10    Date of transaction    11   Date company informed

      ORDINARY SHARES OF 3 1/3p EACH                              6 February 2003             7 February 2003

12    Total holding following this notification             13    Total percentage holding of issued class following
                                                                  this notification
      27,575,998                                                  2.93%


14    Any additional information                            15   Name of contact and telephone number for queries



     NOTIFICATION IN ACCORDANCE WITH S.198-202 COMPANIES
     ACT 1985 THAT THE SHAREHOLDER NAMED IN 2 ABOVE NO
     LONGER HAS A NOTIFIABLE INTEREST IN THE COMPANY            LUKE THOMAS - 01293 767658


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

     Date of notification 10 February 2003                      LUKE THOMAS - DEPUTY COMPANY SECRETARY


London Stock Exchange, Company Announcements Office, Old Broad Street, London
EC2N 1HP

Facsimile: 0207 588 6057, 0207 334 8964/8965/8966 (PLEASE DO NOT POST)

Enquries: Continuing Obligations: Telephone: [phone]


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