Director/PDMR Shareholding

Spirent PLC
08 May 2006


NOTIFICATION OF TRANSACTIONS OF DIRECTORS, PERSONS DISCHARGING MANAGERIAL
RESPONSIBILITY OR CONNECTED PERSONS

This form is intended for use by an issuer to make a RIS notification required
by DR 3.1.4R(1).

     
(1)  An issuer making a notification in respect of a transaction relating to the 
     shares or debentures of the issuer should complete boxes 1 to 16, 23 and 
     24.

(2)  An issuer making a notification in respect of a derivative relating to the 
     shares of the issuer should complete boxes 1 to 4, 6, 8, 13, 14, 16, 23 and 
     24.

(3)  An issuer making a notification in respect of options granted to a director
     /person discharging managerial responsibilities should complete boxes 1 to 
     3 and 17 to 24.

(4)  An issuer making a notification in respect of a financial instrument 
     relating to the shares of the issuer (other than a debenture) should 
     complete boxes 1 to 4, 6, 8, 9, 11, 13, 14, 16, 23 and 24.


Please complete all relevant boxes in block capital letters.

1. Name of the issuer

SPIRENT PLC


2. State whether the notification relates to (i) a transaction notified in
accordance with DR 3.1.4R(1)(a); or

(ii) DR 3.1.4(R)(1)(b) a disclosure made in accordance with section 324 (as
extended by section 328) of the Companies Act 1985; or

(iii) both (i) and (ii)

(iii) THIS NOTIFICATION IS MADE IN ACCORDANCE WITH BOTH


3. Name of person discharging managerial responsibilities/director

ANDERS GUSTAFSSON


4. State whether notification relates to a person connected with a person
discharging managerial responsibilities/director named in 3 and identify the
connected person

N/A


5. Indicate whether the notification is in respect of a holding of the person
referred to in 3 or 4 above or in respect of a non-beneficial interest

N/A


6. Description of shares (including class), debentures or derivatives or
financial instruments relating to shares

N/A


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

N/A


8 State the nature of the transaction

N/A


9. Number of shares, debentures or financial instruments relating to shares
acquired

N/A


10. Percentage of issued class acquired (treasury shares of that class should
not be taken into account when calculating percentage)

N/A


11. Number of shares, debentures or financial instruments relating to shares
disposed

N/A


12. Percentage of issued class disposed (treasury shares of that class should
not be taken into account when calculating percentage)

N/A


13. Price per share or value of transaction

N/A


14. Date and place of transaction

N/A


15. Total holding following notification and total percentage holding following
notification (any treasury shares should not be taken into account when
calculating percentage)

N/A


16. Date issuer informed of transaction

N/A


If a person discharging managerial responsibilities has been granted options by
the issuer complete the following boxes

17 Date of grant

5 MAY 2006


18. Period during which or date on which it can be exercised

STOCK APPRECIATION RIGHT: 5 MAY 2009 TO 4 MAY 2016
PERFORMANCE SHARE AWARD: 5 MAY 2009 TO 5 MAY 2009


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

N/A


20. Description of shares or debentures involved (class and number)

A STOCK APPRECIATION RIGHT OVER 1,334,450 ORDINARY SHARES OF 3 & 1/3 PENCE EACH
AND;

A PERFORMANCE SHARE AWARD OVER 359,300 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 the time of exercise

STOCK APPRECIATION RIGHT: BASE PRICE OF 47.5 PENCE PER SHARE
PERFORMANCE SHARE AWARD: NIL


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

4,925,750 OPTIONS OVER ORDINARY SHARES OF 3 & 1/3 PENCE EACH


23. Any additional information

1. GRANT OF STOCK APPRECIATION RIGHTS

THIS AWARD OF A STOCK APPRECIATION RIGHTS HAS BEEN MADE UNDER THE SPIRENT
EMPLOYEE INCENTIVE PLAN AND VESTING ON THE THIRD ANNIVERSARY OF THE GRANT DATE
IS SUBJECT TO THE COMPANY MEETING THE PERFORMANCE CONDITIONS SET BY THE
REMUNERATION COMMITTEE IN RESPECT OF THIS AWARD.


2. PERFORMANCE SHARE AWARD

THIS AWARD OF PERFORMANCE SHARES, IN THE FORM OF A CONDITIONAL RIGHT TO AN AWARD
OF SHARES, HAS BEEN MADE UNDER THE SPIRENT EMPLOYEE INCENTIVE PLAN. MR
GUSTAFSSON WILL ONLY RECEIVE THE THESE PERFORMANCE SHARES IF HE REMAINS EMPLOYED
BY THE COMPANY ON THAT DATE AND PROVIDED THAT THE COMPANY MEETS THE PERFORMANCE
CONDITIONS SET BY THE REMUNERATION COMMITTEE IN RESPECT OF THIS AWARD.


24. Name of contact and telephone number for queries

WARREN NASH
Tel: [phone]


Name and signature of duly authorised officer of issuer responsible for making
notification

WARREN NASH


Date of notification

8 MAY 2006


END


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