Transaction in Own Shares

Spirent Communications PLC
21 November 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 600,000 ordinary shares at an
average price of 57.7233 pence per share. The highest price and the lowest price
paid for these shares were  58.25 pence and 57.00 pence respectively.

Following the above purchase, Spirent Communications plc holds 90,251,487
Spirent Communications plc ordinary shares in treasury, and has 885,222,564
Spirent Communications plc ordinary shares in issue (excluding treasury shares).



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