Holding in Company

Spirent PLC
2 January 2001

                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY

SPIRENT plc

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

LEXA B.V.

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.

LEXA B.V.               86,724,825
BANK OF NEW YORK 
AS ESCROW AGENT         21,673,432

5)   Number of shares/amount of stock acquired.

     108,398,257

6)   ( 11.7%) of issued Class

7)   Number of shares/amount of stock disposed



8)   ( N/A %) of issued Class

9)   Class of security

     ORDINARY SHARES OF 3 1/2P EACH

10)  Date of transaction

     18 DECEMBER 2000

11)  Date company informed

     28 DECEMBER 2000

12)  Total holding following this notification

     108,398,257
               
              
13)  Total percentage holding of issued class following this notification

     11.7%

14)  Any additional information

     NOTIFICATION IN ACCORDANCE WITH S.198-202
     COMPANIES ACT 1985 THAT A SHAREHOLDER HAS 
     A NOTIFIABLE INTEREST. THIS NOTIFICATION FOLLOWS
     THE ACQUISITION OF HEKIMIAN LABORATORIES INC. OF
     WHICH LEXA B.V. WAS THE PARENT COMPANY

15)  Name of contact and telephone number for queries

     MARK YOUNG - 01293 767710

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

     Date of Notification 2 JANUARY 2001