Holding in Company

Spirent PLC
19 September 2000


                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY

SPIRENT PLC

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

SCOTTISH WIDOWS INVESTMENT PARTNERSHIP LIMITED

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.

SEE SCHEDULE BELOW

5)   Number of shares/amount of stock acquired.

NOT KNOWN

6)   ( N/A %) of issued Class      NOT KNOWN

7)   Number of shares/amount of stock disposed


-

8)   ( N/A %) of issued Class

9)   Class of security

ORDINARY SHARES OF 3 1/3P EACH

10)  Date of transaction

NOT KNOWN

11)  Date company informed

19 SEPTEMBER 2000

12)  Total holding following this notification

18,964,755
               
              
13)  Total percentage holding of issued class following this notification

3.03%

14)  Any additional information

NOTIFICATION IN ACCORDANCE WITH S.198-202 COMPANIES ACT 1985 THAT SHAREHOLDER
HAS A NOTIFIABLE INTEREST

15)  Name of contact and telephone number for queries

JAMES WALL - 01293 767676

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

     Date of Notification ...19 SEPTEMBER 2000



HILL SAMUEL ASSET MANAGEMENT LTD AND SCOTTISH WIDOWS INVESTMENT MANAGEMENT LTD
NOTIFIABLE INTEREST IN SHARES

             Movement of 3% Aggregated Holdings - Material Stock Interests

SEDOL Number:  0472609
Company Name:  Spirent
Stock Description:  Ord GBX3.333333

Amount     Group    Fund   Registered Holder                        Interest
           Company  Code

 2,813,919 HSAM     AA1AA  STATE STREET NOMINEES LIMITED A/C XBY2   MATERIAL
   164,220 HSAM     AA2AA  STATE STREET NOMINEES LIMITED A/C XBY3   MATERIAL
   660,167 HSAM     ALEQ1  GLOBAL INVESTOR SERVICES                 MATERIAL
    62,310 HSAM     ALSPF  HSBC GLOBAL CUSTODY NOMINEE (UK) LTD     MATERIAL
 1,593,443 HSAM     APEQU  HSBC GLOBAL CUSTODY NOMINEES (UK) LTD    MATERIAL
 1,720,174 HSAM     BH2AA  STATE STREET NOMINEES LIMITED A/C XBJ2   MATERIAL
    50,480 HSAM     BH1AA  STATE STREET NOMINEES LIMITED A/C XBJ3   MATERIAL
   179,210 HSAM     GIEQU  STATE STREET NOMINEES LTD A/C XBP7       MATERIAL
 1,705,199 HSAM     GPS    STATE STREET NOMINEES LTD A/C XBY4       MATERIAL
    46,105 HSAM     LGOPS  STATE STREET NOMINEES LTD A/C XBY5       MATERIAL
 1,364,268 HSAM     TSLTM  STATE STREET NOMINEES LTD A/C XBK6       MATERIAL
    10,278 HSAM     TSPIP  C O NOMINEES LIMITED                     MATERIAL
   399,303 SWIM     A2U    RBSTB NOMINEES LTD A/C SW                MATERIAL
 1,447,040 SWIM     FEU    VIDACOS NOMINEES LTD                     MATERIAL
    47,154 SWIM     FIX    VIDACOS NOMINEES LTD                     MATERIAL
    92,220 SWIM     IVP    RBSTB NOMINEES LTD A/C SW                MATERIAL
   730,000 SWIM     N01    RBSTB NOMINEES LTD A/C SW                MATERIAL
   175,623 SWIM     P2U    RBSTB NOMINEES LTD A/C SW                MATERIAL
   780,672 SWIM     PEQ    RBSTB NOMINEES LTD A/C SW                MATERIAL
 4,922,970 SWIM     W01    RBSTB NOMINEES LTD A/C SW                MATERIAL
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18,964,755
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