Transaction in Own Shares

Spirent Communications PLC
20 October 2006

Spirent Communications Plc
Transaction in Own Shares

Spirent Communications PLC announces that it has today purchased through
Citigroup Global Markets U.K. Equity Limited 1,000,000 ordinary shares at an
average price of 60.4043 pence per share. The highest price and the lowest price
paid for these shares were 60.75 pence and 59.75 pence respectively.

Following the above purchase, Spirent Communications plc holds 79,790,000
Spirent Communications plc ordinary shares in treasury, and has 894,417,240
Spirent Communications plc ordinary shares in issue (excluding treasury shares).



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