Director Shareholding

Spirent PLC
10 April 2001



    Michael Arnaouti

    Company Secretary



    10 April 2001



    London Stock Exchange

    Company Announcements Office

    Old Broad Street

    London EC2N 1HP



    Dear Sir / Madam

    SPIRENT plc - STOCK EXCHANGE TICKER SYMBOL SPT

    NOTIFICATION OF INTERESTS IN DIRECTORS AND CONNECTED PERSONS -

    NICHOLAS KELVIN BROOKES

    Spirent plc (the 'Company') announces that 123,000 Performance Units at
    305 pence per Unit were granted on 9 April 2001 to Nicholas Kelvin Brookes
    (the 'Participant') under the terms of the Company's Long Term Share
    Purchase Plan ('LTSPP') (the 'Grant'). A Performance Unit is equivalent to
    one Ordinary share of the Company.

    The Participant is not required to pay any consideration in respect of the
    Grant and his aggregate number of Performance Units held following the
    above award, stands at 428,199.

    Subject to and in accordance with the rules and the operation of the
    LTSPP, the first performance period in respect of the grant will be the
    three years starting from 1 January 2001. The second performance period in
    respect of the Grant will be the three years starting from 1 January 2004.
    Performance conditions apply to both performance periods.

    In respect of the first performance period, the value of the reward will
    be based on the increase in value of the Performance Units between the
    date of Grant and the third anniversary of the Grant. In respect of the
    second performance period, the value of the Grant cannot be determined
    since the Participant has an entitlement to make an election to take any
    reward value in the form of either Company shares and/or cash.

    Yours faithfully




    Michael Arnaouti

    Group Company Secretary

     London Stock Exchange


             NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED

                                   PERSONS
AVS No

All relevant boxes should be completed in typed block capital letters.

1     Name of company                             2     Name of director

      SPIRENT plc                                       NICHOLAS KELVIN BROOKES

  3   Please state whether notification indicates      4    Name of the       
      that it is in                                         registered        
      respect of holding of the director named in 2         holder(s) and, if 
      above or                                              more than one     
      holding of that person's spouse or children           holder, the       
      under the age                                         number of shares  
      of 18 or in respect of a non-beneficial               held by each of   
      interest                                              them. (If         
                                                            notified)         
                                                                              
                                                                              
      IN RESPECT OF THE DIRECTOR'S HOLDING                  NOT NOTIFIED      
    

  5   Please state whether notification relates to a   6    Please state the  
      person(s) connected with the director named in        nature of the     
      2 above and identify                                  transaction. For  
      The connected person(s)                               PEP transactions  
      N/A                                                   please indicate   
                                                            whether           
                                                            general/single co 
                                                            PEP and if        
                                                            discretionary/non 
                                                            discretionary.    


7     Number   8     Percentage 9     Number of   10    Percentage
      of             of issued        shares/           of Issued
      shares/        Class            amount of         Class
      amount                          stock             
      of stock                        disposed
      acquired



11    Class of 12    Price per  13    Date of     14    Date
      security       share            transaction       company
                                                        informed


15  Total holding following this notification          16   Total percentage  
                                                            holding of issued 
                                                            class following   
                                                            this notification 


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
      9 April 2001
                                             9 April 2004 - 8 April 2011

19    Total amount paid (if any) for   20    Description of shares or
      grant of the option                    debentures involved: class,

                                             Number

                                             OPTIONS OVER 205,000 ORDINARY
                                             SHARES OF 31/3 p

21    Exercise price (if fixed at time  22   Total number of shares or
      of grant) or indication that           debentures over which options
      Price is to be fixed at time of        held following this notification
      exercise
                                             665,876
      305 pence

23    Any additional information       24    Name of contact and telephone
                                             number for queries
      Options awarded under the
      Company's Executive Share Option       Jo Gomm - 01293 767656
      Scheme

25    Name and signature of authorised
      company official

      Responsible for making this
      notification                           MICHAEL ARNAOUTI - GROUP COMPANY
                                             SECRETARY
      Date of notification 10 April
      2001

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

Facsimile: 020 7588 6057, 020 7334 8964/8965/8966 (PLEASE DO NOT POST)

Enquiries: Continuing obligations: Telephone: [phone]