Director Shareholding

Spirent PLC
16 August 2001



London Stock Exchange
Company Announcements Office
Old Broad Street
London
EC2N 1HP

(020 7588 6057)

                                                                16 August 2001

Dear Sirs


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
                        1,061                          1.0856
                          663                          0.9361
                          746                          0.8321
                        1,997                          0.9361
                        2,561                          1.0357
                        1,587                          1.5987
                           18                          2.6800
                        8,633




Following this disposal the total number of shares held by the Trust is
4,638,070 shares (representing 0.49912 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.


If you have any queries, please do not hesitate to contact the writer (Tel
01293 767676).




Yours faithfully,







Michael Arnaouti

Company Secretary