Holding(s) in Company

Rockhopper Exploration plc
19 March 2007

Rockhopper Exploration PLC ('the Company')

19 March 2007

                              Notifiable Interest

A form TR-1 containing the following information has been received by the
Company.

TR-1 notification of major interests in shares

1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached:
Rockhopper Exploration PLC

2. Reason for the notification
An acquisition or disposal of voting rights

3. Full name of person(s) subject to the notification obligation:
Schroders plc

4. Full name of shareholder(s) (if different from 3):
N/A

5. Date of the transaction (and date on which the threshold is crossed or
reached if different):
9 March 2007

6. Date on which issuer notified:
12 March 2007

7. Threshold(s) that is/are crossed or reached:
Below 10%

8. Notified details:

A: Voting rights attached to shares

Class/type of  Situation previous to   Resulting situation after the triggering
shares         Triggering transaction  transaction
if possible                            Notification required under DTR 
using ISIN                             transitional provision 7
CODE           
               Number of   Number of   Number    Number of voting    % of voting
               Shares      Voting      of        rights              rights
                           Rights      shares
                                       Direct    Indirect            Indirect
GB00B0FVQX23   7,501,725   7,501,725   N/A       7,501,725           9.915%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of      Expiration Exercise/     Number of voting rights that may    % of
financial    date       Conversion    be acquired if the instrument is    voting
instrument              Period/       exercised/ converted                rights
                        Date
-            -          -             -                                   -

Total (A+B)
Number of voting rights                  % of voting rights
7,501,725                                9.915%

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:
Schroder Investment Management Limited

10. Name of the Proxy holder:
N/A

11. Number of voting rights proxy holder will cease to hold:
N/A

12. Date on which proxy holder will cease to hold voting rights:
N/A

13. Additional information:
The Shares referred to in section 9 are held in portfolios managed by those
firms on a discretionary basis for clients under investment management
agreements.

14. Contact name:
N/A

15. Contact telephone number:
N/A


For further information, please contact:

Rockhopper Exploration plc                     www.rockhopperexploration.co.uk
Sam Moody - Managing Director                  01722 414 419

Aquila Financial Ltd                           www.aquila-financial.com
Peter Reilly                                   020 7202 2601




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