Directors' Notification of Dealing in Shares

Spirent PLC
15 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 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 an 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)

    N/A

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 AND IS THEREFORE
    TREATED AS NO LONGER INTERESTED IN THE SHARES DISPOSED OF BY SPIRENT
    QUEST LIMITED.

7)  Number of shares/amount of
    stock acquired

    -

8)   ( - %)
    of issued Class


9)  Number of shares/amount
    of stock disposed

    13,953

10)  (0.0022%)
   of issued Class


11) Class of security

    ORDINARY SHARES OF 3 1/3P EACH


12) Price per share

    8.034 @ 113.76P
      819 @ 100.02P
    3,909 @ 116.0P
    1,191 @ 103.67P

13) Date of transaction

    15 AUGUST 2000

14) Date company informed

    15 AUGUST 2000

15) Total holding following this notification

        86,553 Personal
     5,037,495 Holding in QUEST (SEE BOX 6)
     8,462,070 Holding in LTSPP (SEE BOX 23)
    ----------
    13,586,118

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         15 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 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 an 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)

    N/A

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 AND IS THEREFORE
    TREATED AS NO LONGER INTERESTED IN THE SHARES DISPOSED OF BY SPIRENT
    QUEST LIMITED

7)  Number of shares/amount of
    stock acquired

    -

8)   ( - %)
    of issued Class


9)  Number of shares/amount
    of stock disposed

    13,953

10)  (0.0022%)
   of issued Class


11) Class of security

    ORDINARY SHARES OF 3 1/3P EACH


12) Price per share

    8.034 @ 113.76P
      819 @ 100.02P
    3,909 @ 116.0P
    1,191 @ 103.67P

13) Date of transaction

    15 AUGUST 2000

14) Date company informed

    15 AUGUST 2000

15) Total holding following this notification

        29,301 Personal
     5,037,495 Holding in QUEST (SEE BOX 6)
     8,462,070 Holding in LTSPP (SEE BOX 23)
    ----------
    13,528,866

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         15 AUGUST 2000