Director Shareholding

Spirent PLC
21 December 2001


Letter dated 20 December 2001

Spirent plc - NOTIFICATION OF DEEMED INTERESTS BY DIRECTORS

Spirent QUEST Limited, the trustee and registered shareholder for the Spirent 
Employee Benefit Trust, has today disposed of the following Ordinary shares in 
Spirent to satisfy the exercise of options under the Company's SAYE Share Option
Scheme:

                No of Shares                   Option Price
                      
                      28,523 @                      0.83209
                         724 @                       1.5987
                       1,330 @                       1.0647
                       3,434 @                      1.03574
                       4,086 @                       1.4210

                      38,097


Following this disposal the total number of shares held by the Trust is 
4,571,286 shares (representing 0.48989% of the issued share capital).

Nicholas Brookes and Eric Hutchinson, both Directors, are potential 
beneficiaries of the Trust (together with all other 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 interests in the Trust have been reduced by the above 
number of shares disposed of.

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