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Spirent Communications PLC - Holding(s) in Company

/ Source: The Associated Press

Form TR-1 with annex. FSA Version 2.1 updated April 2007 TR-1: Notification of Major Interests in Shares 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: Spirent Communications plc 2. Reason for notification (yes/no) An acquisition or disposal of voting rights X An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached An event changing the breakdown of voting rights Other (please specify):______________ 3. Full name of person(s) subject to notification BlackRock, Inc obligation: 4. Full name of shareholder(s) (if different from 3): 5. Date of transaction (and date on which the threshold is crossed or reached if different): 22nd May 2007 6. Date on which issuer notified: 25th May 2007 7. Threshold(s) that is/are crossed or reached: Gone above 5% 8: Notified Details A: Voting rights attached to shares Class/type of Situation previous to Resulting situation after the triggering transaction shares the triggering

transaction If possible use Number of Number of Number of Number of voting rights Percentage of voting ISIN code shares voting shares rights

rights

Direct Indirect Direct Indirect

GB0004726096 N/A N/A N/A N/A 44,428,430 N/A 5.04% B: Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration date Exercise/ conversion No. of voting rights Percentage of voting instrument period/date that may be acquired rights

(if the instrument

exercised/converted) Total (A+B) Number of voting rights Percentage of voting rights

44,428,430 5.04% 9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable: BlackRock Investment Management (UK) Limited -44,428,430 (5.04%) Proxy Voting: 10. Name of proxy holder: 11. Number of voting rights proxy holder will cease to hold: 12. Date on which proxy holder will cease to hold voting rights: 13. Additional information: 14 Contact name: Thomas Hone 15. Contact telephone name: 020 7743 2098 C: Additional information Contact at Issuer: Michael Anscombe, Deputy Company Secretary, Spirent Communications plc Telephone: 01293 767672

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Distributed by the Associated Press