Director Shareholding

Spirent PLC
06 August 2004


                                   SCHEDULE 11

          NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS


1. Name of company

SPIRENT PLC


2. Name of director

ANDERS GUSTAFSSON


3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18 or in respect of a non-beneficial
interest

IN RESPECT OF DIRECTOR'S NON-BENEFICIAL HOLDING (SEE ADDITIONAL INFORMATION - 
NOTE 1 - CONDITIONAL SHARE AWARD)


4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them (if notified)

ORBIS PENSION TRUSTEES LIMITED (SEE ADDITIONAL INFORMATION - NOTE 1 - 
CONDITIONAL SHARE AWARD)


5. Please state whether notification relates to a person(s) connected with the
director named in 2 above and identify the connected person(s)

NOT APPLICABLE


6. Please state the nature of the transaction. For PEP transactions please
indicate whether general/single co PEP and if discretionary/non discretionary

CONDITIONAL SHARE AWARD


7. Number of shares / amount of stock acquired

180,180


8. Percentage of issued class

0.02 %


9. Number of shares/amount of stock disposed

NOT APPLICABLE


10. Percentage of issued class

NOT APPLICABLE


11. Class of security

ORDINARY SHARES OF 3 1/3 PENCE EACH


12. Price per share

55.50 PENCE


13. Date of transaction

5 AUGUST 2004


14. Date company informed

5 AUGUST 2004


15. Total holding following this notification

180,180 ORDINARY SHARES HELD NON-BENEFICIALLY BY THE DIRECTOR (SEE ADDITIONAL
INFORMATION - NOTE 1 - CONDITIONAL SHARE AWARD)


16. Total percentage holding of issued class following this notification

0.02 %


If a director has been granted options by the company please complete the
following boxes.


17. Date of grant

5 AUGUST 2004 (SEE ADDITIONAL INFORMATION - NOTE 2 - GRANT OF SHARE OPTIONS)


18. Period during which or date on which exercisable

SUBJECT TO THE ACHIEVEMENT OF PERFORMANCE CONDITIONS, THE GRANT OF OPTIONS IS
EXERCISABLE BETWEEN 5 AUGUST 2007 AND 4 AUGUST 2014. THE GRANT WILL LAPSE AFTER
4 AUGUST 2014.


19. Total amount paid (if any) for grant of the option

NOT APPLICABLE


20. Description of shares or debentures involved: class, number

1,800,000 OPTIONS OVER ORDINARY SHARES OF 3 1/3 PENCE EACH


21. Exercise price (if fixed at time of grant) or indication that price is to be
fixed at time of exercise

55.50 PENCE EACH


22. Total number of shares or debentures over which options held following this
notification

1,800,000 OPTIONS OVER ORDINARY SHARES OF 3 1/3 PENCE EACH


23. Any additional information

1. CONDITIONAL SHARE AWARD

MR GUSTAFSSON JOINED SPIRENT PLC AS A DIRECTOR ON 2 AUGUST 2004 AND HAS BEEN
GRANTED A CONDITIONAL AWARD OF SHARES. THE SHARES TO SATISFY THE AWARD ARE HELD
BY THE COMPANY'S EMPLOYEE SHARE OWNERSHIP TRUST, ORBIS PENSION TRUSTEES LIMITED.
MR GUSTAFSSON WILL NOT OBTAIN A BENEFICIAL INTEREST IN THE SHARES UNTIL THE
EXPIRY OF THREE YEARS FROM THE DATE HE JOINED THE  COMPANY AT WHICH TIME,
SUBJECT TO HIM STILL BEING IN THE COMPANY'S EMPLOYMENT, THE BENEFICIAL SHARE
INTEREST WILL BE RELEASED TO HIM. THERE ARE NO OTHER PRE-RELEASE PERFORMANCE
CONDITIONS TO BE SATISFIED.

2. GRANT OF SHARE OPTIONS

THE OPTION AWARD WAS MADE UNDER THE SPIRENT EXECUTIVE SHARE OPTION SCHEME.


24. Name of contact and telephone number for queries

LUKE THOMAS : 01293 767658


25. Name and signature of authorised company official responsible for making
this notification

LUKE THOMAS - DEPUTY COMPANY SECRETARY


Date of Notification

6 AUGUST 2004



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