Holding(s) in Company

Ricardo PLC
17 March 2006

                           SCHEDULE 10
 
             NOTIFICATION OF MAJOR INTERESTS IN SHARES


1)   NAME OF COMPANY

     RICARDO PLC

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

     AVIVA PLC AND ITS SUBSIDIARIES

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

     AS 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.

     MORLEY FUND MANAGEMENT LIMITED:
     BNY NORWICH UNION NOMINEES LIMITED     931,037*
     CHASE GA GROUP NOMINEES LIMITED      2,585,597*
     CHASE NOMINEES LIMITED                 267,500*
     CUIM NOMINEE LIMITED                   862,261*

     CHASE NOMINEES LIMITED                     590
     CUIM NOMINEE LIMITED                    56,393
     VIDACOS NOMINEES LIMITED               488,326

     * DENOTES BENEFICIAL INTEREST

5)   Number of shares/amount of stock acquired.

     N/A

6)   Percentage of issued Class 

     N/A

7)   Number of shares/amount of stock disposed

     520,000

8)   Percentage of issued Class 

     1.04%

9)   Class of security

     ORDINARY GBP0.25 SHARES

10)  Date of transaction

     15 MARCH 2006

11)  Date company informed

     16 MARCH 2006

12)  Total holding following this notification

     5,191,704
               
13)  Total percentage holding of issued class following this notification 

     10.38%

14)  Any additional information

     FIGURES ARE BASED ON SHARES IN ISSUE OF 50,010,903

15)  Name of contact and telephone number for queries



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

     Date of Notification ........................





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