Holding in Co - Replacement

Spirent PLC
23 August 2000


The issuer has made the following amendment to the HOLDING IN COMPANY
announcement released on 23 August 2000 at 11:50 under RNS No 8550P.

In Section 11, the Date company informed should read '23 August 2000' and not
'23 May 2000' as previously stated.

All other details remain unchanged.

The full corrected version is shown below.

                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY

SPIRENT PLC

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

PRUDENTIAL 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.

M & G (Lombard St) Noms AA             224,000
M & G (Lombard St) Noms G              150,000
PPMCLT HSBC GIS Nom (UK) SALI          210,000
PRUCLT HASB GIS Nom (UK) PAC a/c    34,111,761
PRUCLT HSBC GIS Nom (UK) PPL a/c     2,657,312


5)   Number of shares/amount of stock acquired.

NOT KNOWN

6)   (  %) of issued Class

NOT KNOWN

7)   Number of shares/amount of stock disposed

NOT KNOWN

8)   (  %) of issued Class

NOT KNOWN

9)   Class of security

ORDINARY SHARES OF 3 1/3p EACH

10)  Date of transaction

NOT KNOWN

11)  Date company informed

23 August 2000

12)  Total holding following this notification

37,353,073
               
              
13)  Total percentage holding of issued class following this notification

5.99%

14)  Any additional information

NOTIFICATION IN ACCORDANCE WITH S.198 COMPANIES ACT 1985 (as amended) OF
REDUCTION IN HOLDING

15)  Name of contact and telephone number for queries

JAMES WALL - 01293 767655

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

     Date of Notification ......23 AUGUST 2000...