Transaction in Own Shares

Spirent Communications PLC
22 May 2006





Spirent Communications plc announces that on 22 May 2006 it purchased from
JPMorgan Cazenove Limited 700,000 Spirent Communications plc ordinary shares at
an average price of 41 pence per share. The purchased shares will be held as
treasury shares. Following the above purchase, Spirent Communications plc holds
4,700,000 Spirent Communications plc ordinary shares in treasury, and has
965,750,508 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




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