Director/PDMR Shareholding

Spirent PLC
29 December 2005



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



Spirent Sharesave Trust Limited, the trustee for the Spirent Sharesave Trust ('
the Trust'), on 28 December 2005, transferred 34,202 Ordinary shares in Spirent
plc (the 'Company') at an option price of 41 pence per share to satisfy the
exercise of options under the Company's Savings Related Share Option Scheme.
Following this transfer the total number of Ordinary shares held by the Trust 
is:



3,231,940 (representing 0.3346% 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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