RNS Number:0844R
Datamonitor PLC
20 October 2003


                           SCHEDULE 10
 
             NOTIFICATION OF MAJOR INTERESTS IN SHARES


1)   NAME OF COMPANY
     DATAMONITOR PLC


2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST
     REUTERS 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
     SEE 2 ABOVE


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


5)   Number of shares/amount of stock acquired.
     


6)   Percentage of issued Class


7)   Number of shares/amount of stock disposed
     3,500,000

8)   Percentage of issued Class
     4.97%

9)   Class of security
     ORDINARY SHARES OF 10 PENCE EACH


10)  Date of transaction
     8 OCTOBER 2003


11)  Date company informed
     13 OCTOBER 2003


12)  Total holding following this notification
     7,411,258

               
13)  Total percentage holding of issued class following this notification
     10.53%


14)  Any additional information



15)  Name of contact and telephone number for queries
     ANDREW GILCHRIST     +44 (207) 675 7280


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

     Date of Notification
     20 OCTOBER 2003


                      This information is provided by RNS
            The company news service from the London Stock Exchange

END

HOLBDBDGRXDGGXG