Holding in Company

Spirent PLC
9 January 2001

                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY

SPIRENT PLC


2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

HALIFAX GROUP PLC


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

SHAREHOLDER IN 2 ABOVE


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

FUND WPUKEQ - CHASE NOMINEES LTD                             25,343,205
FUND HLOP - GLOBENET NOMINEES LTD                               723,187
FUND HPOP - GLOBENET NOMINEES LTD                                21,333
FUND HPBA - GLOBENET NOMINEES LTD                                13,816
FUND HLBA - GLOBENET NOMINEES LTD                               384,035
FUND PA0159 - MSS NOMINEES LTD                                    5,600
FUND PA0434 - MSS NOMINEES LTD                                    1,514
FUND 1105 - CHASE NOMINEES LTD                                1,138,250
FUND 2304 - CHASE NOMINEES LTD                                3,413,768
FUND 2314 - CHASE NOMINEES LTD                                1,908,979
FUND GROW00 - CMI INTL MIXED FUND                               107,058
FUND RISE00 - CMI INTL EQUITY FUND                               38,594
FUND UKEQ00 - CMI UK EQUITY FUND                                187,291
FUND UKTRA0 - CLMI UK TRACKING FUND                              22,257
FUND RF82 - HSBC GLOBAL CUSTODY NOMS                            152,100
FUND RF83 - HSBC GLOBAL CUSTODY NOMS                             11,700
FUND RF91 - HSBC GLOBAL CUSTODY NOMS                             79,200
FUND RF92 - HSBC GLOBAL CUSTODY NOMS                              6,300



5)   Number of shares/amount of stock acquired.

NOT KNOWN

6)   ( NOT KNOWN %) of issued Class

7)   Number of shares/amount of stock disposed

NOT KNOWN

8)   ( NOT KNOWN %) of issued Class

9)   Class of security

ORDINARY SHARES OF 3-1/3P EACH

10)  Date of transaction

NOT KNOWN

11)  Date company informed

5 JANUARY 2001

12)  Total holding following this notification

33,558,187
               
              
13)  Total percentage holding of issued class following this notification

3.62%

14)  Any additional information

NOTIFICATION IN ACCORDANCE WITH S.198 COMPANIES ACT 1985 (AS AMENDED) IN
REDUCTION IN HOLDING FROM 4.94%

15)  Name of contact and telephone number for queries

LUKE THOMAS - 01293 767658

16)  Name and signature of authorised company official responsible for 
     making this notification

LUKE THOMAS  -  01293 767658

     Date of Notification              8 JANUARY 2001