Holding in Company

Spirent PLC
12 January 2001


                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY

SPIRENT PLC


2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

MR IAIN MILNES


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.

MR IAIN MILNES - 35,009,578


5)   Number of shares/amount of stock acquired.

N/A


6)   ( N/A %) of issued Class

7)   Number of shares/amount of stock disposed

N/A


8)   ( N/A %) of issued Class

9)   Class of security

ORDINARY SHARES OF 3 1/3P EACH


10)  Date of transaction

N/A


11)  Date company informed

11 JANUARY 2001


12)  Total holding following this notification

35,009,578

               
              
13)  Total percentage holding of issued class following this notification

3.78%


14)  Any additional information

NOTIFICATION IN ACCORDANCE WITH S.198-202 COMPANIES ACT 1985 THAT A SHAREHOLDER
HAS A NOTIFIABLE INTEREST. THERE HAS BEEN A DECREASE IN THE PERCENTAGE HOLDING
AS A RESULT OF THE ISSUANCE OF 249,087,519 ORDINARY SHARES IN CONNECTION WITH
THE ACQUISITION OF HEKIMIAN LABORATORIES INC IN DECEMBER 2000. THE NUMBER OF
SHARES HELD (AS REPORTED IN BOX 12 ABOVE) IS UNCHANGED FROM THE PREVIOUS
NOTIFICATION MADE ON 14 NOVEMBER 2000.


15)  Name of contact and telephone number for queries

LUKE THOMAS
01293 767676


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

     Date of Notification    12 JANUARY 2001