Transaction in Own Shares

Spirent Communications PLC
12 March 2008


Spirent Communications plc: Transaction in own shares.

Spirent Communications plc announces that it has today purchased through UBS
Limited 300,000 Ordinary shares at an average price of 62.0 pence per share. The
highest price and the lowest price paid for these shares were 62.3 pence and
61.8 pence respectively.

Spirent Communications plc intends to hold the purchased shares in treasury.

Following the purchase of these shares, Spirent Communications plc holds
70,525,057 of its ordinary shares in treasury and has 770,288,944 ordinary
shares in issue (excluding treasury shares).  This figure (770,288,944)
represents the total voting rights in the Company and may be used by
shareholders as the denominator for the calculations by which they can determine
if they are required to notify their interest in, or a change to their interest
in, the Company under the Financial Services Authority's Disclosure and
Transparency Rules.


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