Spirent PLC Announces Schedule 10 Notification Of Major Interests In Shares


LONDON, Nov. 25, 2004 (PRIMEZONE) --



                              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 designation      Holding

    BARCLAYS CAPITAL NOMINEES LIMI                         804,872
    CHASE NOMINEES LTD                  16376              562,967
    CHASE NOMINEES LTD                  20947           29,821,307
    CHASE NOMINEES LTD                  21359            1,267,026
    INVESTORS BANK AND TRUST CO                            116,208
    INVESTORS BANK AND TRUST CO                            298,290
    INVESTORS BANK AND TRUST CO                            369,757
    INVESTORS BANK AND TRUST CO                             12,766
    JP MORGAN (BGI CUSTODY)             16331              351,468
    JP MORGAN (BGI CUSTODY)             16341            1,453,016
    JP MORGAN (BGI CUSTODY)             16341              550,836
    JP MORGAN (BGI CUSTODY)             16344              473,746
    JP MORGAN (BGI CUSTODY)             16345              820,410
    JP MORGAN (BGI CUSTODY)             16400            9,999,746
    JP MORGAN (BGI CUSTODY)             18409              484,895
    JP MORGAN CHASE BANK                                   633,980
    JP MORGAN CHASE BANK                                   360,275
    JP MORGAN CHASE BANK                                   409,555
    JP MORGAN CHASE BANK                                   179,290
    R C GREIG NOMINEES LIMITED A/C       BL1               134,745
    R C GREIG NOMINEES LIMITED A/C       CM1                35,079
    R C GREIG NOMINEES LIMITED GP1       GP1                34,067
    R C GREIG NOMINEES LIMITED SA1       SA1                22,152
    ZEBAN NOMINEES LIMITED                                   1,000

                                        TOTAL           49,197,453


 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

    HOLDING AS AT 23 NOVEMBER 2004

 11.Date company informed

    25 NOVEMBER 2004

 12.Total holding following this notification

    49,197,453

 13.Total percentage holding of issued class following this
    notification

    5.15%

 14.Any additional information

    NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT
    THE SHAREHOLDER NAMED IN 2 ABOVE HAS INCREASED THEIR NOTIFIABLE
    SHAREHOLDING IN SPIRENT PLC TO 5.15%.  SHAREHOLDER PREVIOUSLY
    REPORTED A SHAREHOLDING OF 47,205,061 SHARES (4.94%) ON 01
    NOVEMBER 2004.

 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

 25 NOVEMBER 2004

 The FSA does not give any express or implied warranty as to the
 accuracy of this document or material and does not accept any
 liability for error or omission. The FSA is not liable for any
 damages (including, without limitation, damages for loss of business
 or loss of profits) arising in contract, tort or otherwise from the
 use of or inability to use this document, or any material contained
 in it, or from any action or decision taken as a result of using this
 document or any such material.


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