Transaction in Own Shares

Spirent Communications PLC
02 April 2007


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through 
ABN AMRO Bank NV 250,000 ordinary shares at an average price of 60.9 pence 
per share. The highest price and the lowest price paid for these shares were 
61 pence and 60.75 pence respectively.Spirent Communications plc intends to 
hold the purchased shares in treasury.

Following the purchase of these shares, Spirent Communications plc holds
74,260,000 of its ordinary shares in treasury and has 882,644,785 ordinary
shares in issue (excluding treasury shares). This figure (882,644,785)
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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