Holding(s) in Company

Spirent PLC 20 February 2006 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of listed company SPIRENT PLC 2. Name of shareholder with a major interest BARCLAYS PLC 3. Please state whether notification indicates that regarding the holding of the shareholder named in 2 above; 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 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 IRELAND 258227 943,383 BANK OF IRELAND 4239749 1,483,297 Bank of Ireland Nominees Limited CREST ID. 11X13 1,299,000 BANK OF NEW YORK 210405 1,009,027 BANK OF NEW YORK 214075 5,492,767 BANK OF NEW YORK 221428 832,837 BANK OF NEW YORK 367748 2,907,094 BANK OF NEW YORK 392067 3,326,323 BANK OF NEW YORK 768198 257,328 BARCLAYS CAPITAL NOMINEES LIMITED -355,650 BARCLAYS CAPITAL NOMINEES LIMITED 450,463 BARCLAYS CAPITAL NOMINEES LIMITED 1,842,869 BARCLAYS CAPITAL NOMINEES LIMITED -116,031 Barclays Noms Monument R97 C 000000000000000000 1,053 Barclays Trust Co & Others 8,077 BNP PARIBAS 166,333 BNY (OCS) NOMINEES LTD 221476 325,600 BOISS NOMINEES LTD 4224361 567,086 CHASE NOMINEES LTD 16376 527,631 CHASE NOMINEES LTD 16530 187,794 CHASE NOMINEES LTD 16669 134,728 CHASE NOMINEES LTD 18243 123,823 CHASE NOMINEES LTD 19518 350,116 CHASE NOMINEES LTD 19519 2,722,202 CHASE NOMINEES LTD 20947 36,805,116 CHASE NOMINEES LTD 21359 1,483,196 CHASE NOMINEES LTD 25772 849,762 CHASE NOMINEES LTD 27793 56,306 CHASE NOMINEES LTD 27797 138,568 CHASE NOMINEES LTD 27800 1,037,801 CHASE NOMINEES LTD 28270 955,621 CHASE NOMINEES LTD 28270 307,679 CHASE NOMINEES LTD 31961 2,240,624 CIBC MELLON GLOBAL SECURITIES 107,805 CITIBANK 6010640794 241,026 CITIBANK 6010782807 462,289 DEUTSCHE BANK LONDON 8003168 30,331 Gerrard Nominees Limited 603856 1,208 Gerrard Nominees Limited 642367 13,000 Gerrard Nominees Limited 647291 8,500 Gerrard Nominees Limited 650668 13,000 Gerrard Nominees Limited 653035 13,000 Gerrard Nominees Limited 660632 6,000 Gerrard Nominees Limited 660758 35,000 Gerrard Nominees Limited 660851 30,000 Greig Middleton Nominees Limited (GM1) 11,750 Greig Middleton Nominees Limited (GM1) 220,787 HSBC 813168 869,384 HSBC 845315 27,190 INVESTORS BANK AND TRUST CO. 2,082,285 INVESTORS BANK AND TRUST CO. 944,626 INVESTORS BANK AND TRUST CO. 5,535,120 INVESTORS BANK AND TRUST CO. 610,700 INVESTORS BANK AND TRUST CO. 221,432 INVESTORS BANK AND TRUST CO. 54,686 INVESTORS BANK AND TRUST CO. 154,750 INVESTORS BANK AND TRUST CO. 22,464 JP MORGAN (BGI CUSTODY) 16331 268,775 JP MORGAN (BGI CUSTODY) 16341 2,160,554 JP MORGAN (BGI CUSTODY) 16341 560,581 JP MORGAN (BGI CUSTODY) 16344 687,727 JP MORGAN (BGI CUSTODY) 16345 1,158,601 JP MORGAN (BGI CUSTODY) 16400 9,953,381 JP MORGAN (BGI CUSTODY) 16612 342,149 JP MORGAN (BGI CUSTODY) 16621 277,635 JP MORGAN (BGI CUSTODY) 16644 559,641 JP MORGAN (BGI CUSTODY) 16901 167,869 JP MORGAN (BGI CUSTODY) 18409 791,821 JP MORGAN (BGI CUSTODY) 19514 141,755 JP MORGAN (BGI CUSTODY) 28166 2,892,184 JPMORGAN CHASE BANK 346,760 JPMorgan Chase Bank 399,337 JPMorgan Chase Bank 555,319 MELLON BANK ABGFZ872482 640,798 MELLON BANK TGGF0003002 295,962 Mellon Trust - US CUSTODIAN / 264,058 MELLON TRUST OF NEW ENGLAND 283,690 MIDLAND BANK (HSBC BANK PLC) 772823 2,901,921 NON-IMA DUMMY 708,218 NON-IMA DUMMY 1,095,438 NON-IMA DUMMY 6,980,817 NON-IMA DUMMY 550,285 NON-IMA DUMMY 116,798 NON-IMA DUMMY 586,640 NON-IMA DUMMY 2,358,360 NORTHERN TRUST CVS21 1,242,437 NORTHERN TRUST SCO06 303,975 NORTHERN TRUST TNF01 532,061 NORTHERN TRUST UKE01 1,049,771 NORTHERN TRUST USF12 1,681,150 NORTHERN TRUST BANK - BGI SEPA 409,685 NORTHERN TRUST BANK - BGI SEPA 357,219 NORTHERN TRUST BANK - BGI SEPA 92,784 R C Greig Nominees Limited 961,234 R C Greig Nominees Limited 377,516 R C Greig Nominees Limited a/c AK1 742,193 R C Greig Nominees Limited a/c AK1 100,795 R C Greig Nominees Limited a/c BL1 88,881 R C Greig Nominees Limited a/c BL1 32,933 R C Greig Nominees Limited a/c CM1 6,650 R C Greig Nominees Limited a/c CM1 24,646 R C Greig Nominees Limited GP1 64,589 R C Greig Nominees Limited GP1 51,481 R C Greig Nominees Limited SA1 31,232 R C Greig Nominees Limited SA1 65,680 R C Greig Nominees Limited SA1 WIVE002 1,033 STATE STREET 2RJ2 103,736 STATE STREET JD12 482,919 STATE STREET JFBL 301,092 STATE STREET N3B6 41,154 STATE STREET N3YZ 10,871 STATE STREET TRUST OF CANADA - 126,407 The Northern Trust Company - U 177,135 ZEBAN NOMINEES LIMITED 1,000 ZEBAN NOMINEES LIMITED 1,700 TOTAL 127,589,189 5. Number of shares / amount of stock acquired NOT KNOWN 6. Percentage of issued class (any treasury shares held by the listed company should not be taken into account when calculating percentage) NOT KNOWN 7. Number of shares / amount of stock disposed - 8. Percentage of issued class (any treasury shares held by the listed company should not be taken into account when calculating percentage) - 9. Class of security ORDINARY SHARES OF 3.3333 PENCE EACH 10. Date of transaction HOLDING AS AT 14 FEBRUARY 2006 11. Date company informed 17 FEBRUARY 2006 12. Total holding following this notification 127,589,189 13. Total percentage holding of issued class following this notification (any treasury shares held by the listed company should not be taken into account when calculating percentage) 13.21% 14. Any additional information SHAREHOLDER PREVIOUSLY REPORTED A SHAREHOLDING OF 115,783,982 (12.07%) ON 21 FEBRUARY 2005 AND 122,266,395 (12.67%) ON 10 NOVEMBER 2005. 15. Name of contact and telephone number for queries LUKE THOMAS - 01293 767658 16. Name and signature of duly authorised company official of the listed company responsible for making this notification LUKE THOMAS - DEPUTY COMPANY SECRETARY Date of notification 20 FEBRUARY 2006 This information is provided by RNS The company news service from the London Stock Exchange

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