Directors' Notification of Dealing in Shares

Spirent PLC
1 August 2000


                       DEALINGS BY DIRECTORS


1)  NAME OF COMPANY

    SPIRENT PLC


2)  NAME OF DIRECTOR

    NICHOLAS KELVIN BROOKES


3)  Please state whether notification indicates that it is in respect of
    holding of the Director named in 2 above or holding of that person's
    spouse or children under the age of 18 or in respect of a non-beneficial
    interest

    HOLDING BY EMPLOYEE BENEFIT TRUST OF WHICH DIRECTORS ARE BENEFICIARIES


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

    SPIRENT QUEST LIMITED


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



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

    THE DIRECTOR IN 2 ABOVE, TOGETHER WITH ALL OTHER EMPLOYEE OPTION HOLDERS
    IS A POTENTIAL BENEFICIARY OF THE EMPLOYEE BENEFIT TRUST TO THE EXTENT
    OF HIS INDIVIDUAL SAYE SHARE OPTION HOLDING & IS THEREFORE TREATED AS NO 
    LONGER INTERESTED IN THE SHARES DISPOSED OF BY SPIRENT QUEST LTD


7)  Number of shares/amount of
    stock acquired



8)   (    % )
    of issued Class

9)  Number of shares/amount
    of stock disposed

    8,331


10)  (0.0013% )
   of issued Class

11) Class of security

    ORDINARY SHARES OF 3 1/2P EACH


12) Price per share

    4131 @ 130.7P
    3720 @ 116P
    480  @ 124.67P


13) Date of transaction

    31 JULY 2000


14) Date company informed

    31 JULY 2000
  

15) Total holding following this notification

       86,563  PERSONAL
    5,051,448  HOLDING IN QUEST (SEE BOX 6)
    8,462,070  HOLDING IN LTSPP (SEE BOX 23)

   13,600,071

16) Total percentage holding of issued class following this notification

    2.176%


     IF A DIRECTOR HAS BEEN GRANTED OPTIONS BY THE COMPANY PLEASE
                    COMPLETE THE FOLLOWING BOXES

17) Date of grant



18) Period during which or date on which exercisable



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



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



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



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



23) Any additional information

    THE DIRECTOR IN 2 ABOVE, TOGETHER WITH ALL OTHER EMPLOYEES, IS A 
    POTENTIAL BENEFICIARY OF THE EMPLOYEE BENEFIT TRUSTS ESTABLISHED IN
    RESPECT OF THE LTSPP TO PROVIDE SPIRENT ORDINARY SHARES UNDER A LONG
    TERM SHARE PURCHASE PLAN.
    THIS IS NOT A DEALING BY A DIRECTOR.


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


    Date of Notification  1 AUGUST 2000


                       DEALINGS BY DIRECTORS


1)  NAME OF COMPANY

    SPIRENT PLC


2)  NAME OF DIRECTOR

    ERIC GEORGE HUTCHINSON


3)  Please state whether notification indicates that it is in respect of
    holding of the Director named in 2 above or holding of that person's
    spouse or children under the age of 18 or in respect of a non-beneficial
    interest

    HOLDING BY EMPLOYEE BENEFIT TRUST OF WHICH DIRECTORS ARE BENEFICIARIES


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

    SPIRENT QUEST LIMITED


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



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

    THE DIRECTOR IN 2 ABOVE, TOGETHER WITH ALL OTHER EMPLOYEE OPTION HOLDERS
    IS A POTENTIAL BENEFICIARY OF THE EMPLOYEE BENEFIT TRUST TO THE EXTENT
    OF HIS INDIVIDUAL SAYE SHARE OPTION HOLDING & IS THEREFORE TREATED AS NO 
    LONGER INTERESTED IN THE SHARES DISPOSED OF BY SPIRENT QUEST LTD


7)  Number of shares/amount of
    stock acquired



8)   (    % )
    of issued Class

9)  Number of shares/amount
    of stock disposed

    8,331


10)  (0.0013% )
   of issued Class

11) Class of security

    ORDINARY SHARES OF 3 1/2P EACH


12) Price per share

    4131 @ 130.7P
    3720 @ 116P
    480  @ 124.67P


13) Date of transaction

    31 JULY 2000


14) Date company informed

    31 JULY 2000
  

15) Total holding following this notification

       29,301  PERSONAL
    5,051,448  HOLDING IN QUEST (SEE BOX 6)
    8,462,070  HOLDING IN LTSPP (SEE BOX 23)

   13,542,819

16) Total percentage holding of issued class following this notification

    2.167%


     IF A DIRECTOR HAS BEEN GRANTED OPTIONS BY THE COMPANY PLEASE
                    COMPLETE THE FOLLOWING BOXES

17) Date of grant



18) Period during which or date on which exercisable



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



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



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



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



23) Any additional information

    THE DIRECTOR IN 2 ABOVE, TOGETHER WITH ALL OTHER EMPLOYEES, IS A 
    POTENTIAL BENEFICIARY OF THE EMPLOYEE BENEFIT TRUSTS ESTABLISHED IN
    RESPECT OF THE LTSPP TO PROVIDE SPIRENT ORDINARY SHARES UNDER A LONG
    TERM SHARE PURCHASE PLAN.
    THIS IS NOT A DEALING BY A DIRECTOR.


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


    Date of Notification  1 AUGUST 2000