Director/PDMR Shareholding

Spirent PLC
01 March 2006



SPIRENT PLC - NOTIFICATION OF DEEMED INTERESTS BY DIRECTORS, PERSONS DISCHARGING
MANAGERIAL RESPONSIBILITY OR CONNECTED PERSONS



The Company was notified on 28 February 2006 that, Spirent Sharesave Trust
Limited, the trustee for the Spirent Sharesave Trust ('the Trust'), had
transferred 319,133 Ordinary shares in Spirent plc (the 'Company') to satisfy
the exercise of options under the Company's Savings Related Share Option Scheme
as follows:


                 No of Shares                         Option Price

                      105,807                             41 pence
                      213,326                             38 pence
                      319,133



Following this transfer the total number of Ordinary shares held by the 
Trust is:



2,777,967 (representing 0.2874% of the issued share capital of the Company).



The Company's executive directors are potential beneficiaries of the Trust
(together with all other UK employee share option holders) and are, therefore,
treated under the Companies Act 1985 as having a deemed interest in the total
number of shares held by the Trust. As a result, the directors' deemed interest
in the Trust has been reduced by the above number of shares transferred.



For the avoidance of doubt, the Company confirms that this notification does not
relate to an actual dealing in securities by the executive directors whose
interests in the Company's securities remain unchanged notwithstanding the above
events.









END


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