Spirent PLC -- Holding(s) in Company

Schedule 10


CRAWLEY, U.K., Oct. 1, 2004 (PRIMEZONE) -- Spirent PLC:

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
   BANK OF NEW YORK                 214075                3,861,569
   BANK OF NEW YORK                 221428                524,342
   BANK OF NEW YORK                 367748                2,596,205
   BANK OF NEW YORK                 392067                3,952,562
   BANK OF NEW YORK                 392177                313,638
   BARCLAYS CAPITAL NOMINEES LIMI                         754,502
   BNY (OCS) NOMINEES LTD           221476                252,149
   BNY (OCS) NOMINEES LTD           387173                123,795
   BOISS NOMINEES LTD               4224361               394,969
   CHASE NOMINEES LTD               16376                 531,812
   CHASE NOMINEES LTD               16649                 41,844
   CHASE NOMINEES LTD               16669                 63,310
   CHASE NOMINEES LTD               18243                 123,823
   CHASE NOMINEES LTD               19518                 253,833
   CHASE NOMINEES LTD               19519                 2,464,292
   CHASE NOMINEES LTD               19520                 638,744
   CHASE NOMINEES LTD               20947                 36,769,332
   CHASE NOMINEES LTD               21359                 1,220,660
   CHASE NOMINEES LTD               25772                 520,077
   CHASE NOMINEES LTD               27793                 74,767
   CHASE NOMINEES LTD               27795                 114,340
   CHASE NOMINEES LTD               27797                 138,568
   CHASE NOMINEES LTD               27799                 299,495
   CHASE NOMINEES LTD               27800                 1,145,581
   CHASE NOMINEES LTD               27802                 40,008
   CHASE NOMINEES LTD               28269                 106,605
   CHASE NOMINEES LTD               28270                 590,971
   CHASE NOMINEES LTD               28270                 266,132
   CHASE NOMINEES LTD               31961                 1,347,971
   CIBC MELLON GLOBAL SECURITIES                          34,666
   CITIBANK                         6010613363            333,841
   CITIBANK                         6010640794            252,237
   CITIBANK                         6010782807            275,601
   DEUTSCHE (BANKERS TRUST)         501575013             378,406
   DEUTSCHE BANK LONDON             8003168               30,331
   HSBC                             813168                808,840
   HSBC                             814537                80,198
   HSBC                             845315                23,453
   INVESTORS BANK AND TRUST CO                            314,881
   INVESTORS BANK AND TRUST CO                            841,643
   INVESTORS BANK AND TRUST CO                            2,914,583
   INVESTORS BANK AND TRUST CO                            10,802
   INVESTORS BANK AND TRUST CO                            349,682
   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                 8,915,859
   JP MORGAN (BGI CUSTODY)          16612                 154,621
   JP MORGAN (BGI CUSTODY)          16621                 186,353
   JP MORGAN (BGI CUSTODY)          16644                 420,978
   JP MORGAN (BGI CUSTODY)          16901                 127,521
   JP MORGAN (BGI CUSTODY)          18409                 526,737
   JP MORGAN (BGI CUSTODY)          19514                 128,618
   JP MORGAN (BGI CUSTODY)          27795                 258,537
   JP MORGAN (BGI CUSTODY)          27799                 785,257
   JP MORGAN (BGI CUSTODY)          28166                 3,027,976
   JP MORGAN (BGI CUSTODY)          29514                 117,527
   JPM FRANKFURT                    27717                 67,625
   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                                   188,365
   MELLON BANK                      ABGFZ872482           745,728
   MELLON BANK                      TGGF0003002           91,742
   MELLON TRUST - BOSTON & SF                             128,392
   MELLON TRUST OF NEW ENGLAND                            193,162
   MIDLAND BANK (HSBC BANK PLC)     772823                1,951,762
   NORTHERN TRUST                   CVS21                 987,313
   NORTHERN TRUST                   LIV02                 746,036
   NORTHERN TRUST                   SCO06                 303,975
   NORTHERN TRUST                   TNF01                 384,795
   NORTHERN TRUST                   USF06                 193,023
   NORTHERN TRUST                   USF12                 1,760,355
   NORTHERN TRUST BANK - BGI SEPA                         168,498
   NORTHERN TRUST BANK - BGI SEPA                         41,732
   NORTHERN TRUST BANK - BGI SEPA                         256,471
   R C GREIG NOMINEES LIMITED A/C   BL1                   140,823
   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
   STATE STREET                     2RJ2                  127,458
   STATE STREET                     JD12                  447,165
   STATE STREET                     N3B2                  8,621
   STATE STREET                     N3B6                  273,550
   STATE STREET                     N3YZ                  10,446
   STATE STREET                     VE4J                  205,686
   VIDACOS NOMINEES LIMITED         6010830763            1,800,140
   ZEBAN NOMINEES LIMITED                                 21,700
   ZEBAN NOMINEES LIMITED                                 1,000
                                    TOTAL                 97,332,138

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 28 SEPTEMBER 2004

11. Date company informed

01 OCTOBER 2004

12. Total holding following this notification

97,332,138

13. Total percentage holding of issued class following this notification

10.20%

14. Any additional information

NOTIFICATION RECEIVED PURSUANT TO S198-202 COMPANIES ACT 1985 THAT THE SHAREHOLDER NAMED IN 2 ABOVE HAS DECREASED THEIR SHAREHOLDING IN SPIRENT PLC TO 10.20%. SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 105,945,146 SHARES (11.17%) ON 12 MARCH 2004.

15. Name of contact and telephone number for queries

MICHAEL ANSCOMBE - 01293 767672

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

MICHAEL ANSCOMBE - ASSISTANT COMPANY SECRETARY

Date of notification

01 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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