Spirent PLC -- Holding(s) in Company


CRAWLEY, UK, Oct. 7, 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                         754,502
   CHASE NOMINEES LTD               16376                 531,812
   CHASE NOMINEES LTD               20947                 32,662,417
   CHASE NOMINEES LTD               21359                 1,220,660
   CIBC MELLON GLOBAL SECURITIES                          34,666
   INVESTORS BANK AND TRUST CO                            552,782
   INVESTORS BANK AND TRUST CO                            2,200,489
   INVESTORS BANK AND TRUST CO                            316,873
   INVESTORS BANK AND TRUST CO                            10,802
   INVESTORS BANK AND TRUST CO                            314,881
   INVESTORS BANK AND TRUST CO                            111,024
   JP MORGAN (BGI CUSTODY)          16331                 268,799
   JP MORGAN (BGI CUSTODY)          16341                 667,949
   JP MORGAN (BGI CUSTODY)          16341                 1,754,917
   JP MORGAN (BGI CUSTODY)          16344                 400,264
   JP MORGAN (BGI CUSTODY)          16345                 742,167
   JP MORGAN (BGI CUSTODY)          16400                 9,220,753
   JP MORGAN (BGI CUSTODY)          18409                 526,737
   JP MORGAN CHASE BANK                                   360,275
   JP MORGAN CHASE BANK                                   381,288
   JP MORGAN CHASE BANK                                   479,984
   JP MORGAN CHASE BANK                                   6,566
   JP MORGAN CHASE BANK                                   68,109
   MELLON TRUST - BOSTON & SF                             136,755
   MELLON TRUST OF NEW ENGLAND                            141,218
   NORTHERN TRUST BANK - BGI SEPA                         179,339
   NORTHERN TRUST BANK - BGI SEPA                         123,980
   NORTHERN TRUST BANK - BGI SEPA                         29,889
   R C GREIG NOMINEES LIMITED A/C   BL1                   138,823
   R C GREIG NOMINEES LIMITED A/C   CM1                   32,079
   R C GREIG NOMINEES LIMITED GP1   GP1                   34,067
   R C GREIG NOMINEES LIMITED SA1   SA1                   22,152
   ZEBAN NOMINEES LIMITED                                 1,000
                                    TOTAL                 54,428,018


5. Number of shares / amount of stock acquired

-

6. Percentage of issued class

-

7. Number of shares / amount of stock disposed

NOT NOTIFIED

8. Percentage of issued class

NOT NOTIFIED

9. Class of security

ORDINARY SHARES OF 3.3333 PENCE EACH

10. Date of transaction

HOLDING AS AT 30 SEPTEMBER 2004

11. Date company informed

07 OCTOBER 2004

12. Total holding following this notification

54,428,018

13. Total percentage holding of issued class following this notification

5.70%

14. Any additional information

NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE SHAREHOLDER NAMED IN 2 ABOVE HAS DECREASED THEIR NOTIFIABLE SHAREHOLDING IN SPIRENT PLC TO 5.71%. SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 97,332,138 SHARES (10.20%) ON 01 OCTOBER 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

07 OCTOBER 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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