Holding(s) in Company

Spirent PLC
22 January 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                                                      Prudential plc


3    Please state whether notification indicates that it is in   4    Name of the registered holder(s) and, if more
     respect of holding of the shareholder named in 2 above or        than one holder, the number of shares held by
     in respect of a non-beneficial interest or in the case of        each of them
     an individual holder if it is a holding of that person's
     spouse or children under the age of 18                           

     SHAREHOLDER IN 2 ABOVE                                           M&G (LOMBARD ST) NOMS FPE              85,656
                                                                      MAGIM HSBC GIS NOM(UK) SALI           240,957
                                                                      PRUCLT HSBC GIS NOM(UK) PAC AC     42,469,044
                                                                      PRUCLT HSBC GIS NOM(UK) PHL AC      1,265,804
                                                                      PRUCLT HSBC GIS NOM(UK) PPL AC      1,858,111
                                                                      PRUCLT HSBC GIS NOM(UK) SAL AC         25,333
                                                                      ROY NOMINEES 578079                   261,602
                                                                      ROY NOMS LTD 578052                   148,721
                                                                      ROY NOMS LTD 578060                   802,671
                                                                      ROY NOMS LTD 578141                   292,994
                                                                      ROY NOMS LTD 578192                   642,708


5    Number of shares 6   Percentage of     7   Number of shares 8    Percentage of Issued
     / amount of          Issued                /amount of stock      Class
     stock acquired       Class                 disposed              
                          
     2,066,429            0.22%



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

      ORDINARY SHARES OF 3 1/3p EACH                              NOT KNOWN                   22 JANUARY 2003


12    Total holding following this notification             13    Total percentage holding of issued class following
                                                                  this notification
      48,093,601
                                                                  5.10%


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

     NOTIFICATION IN ACCORDANCE WITH S.198 COMPANIES ACT
     1985 (AS AMENDED)                                          LUKE THOMAS - 01293 767658


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


     Date of notification 22 JANUARY 2003                       LUKE THOMAS - DEPUTY COMPANY SECRETARY



London Stock Exchange, Company Announcements Office, Old Broad Street, London
EC2N 1HP
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Enquries: Continuing Obligations: Telephone: [phone]



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