Holding(s) in Company

Rockhopper Exploration plc
22 May 2007




Rockhopper Exploration PLC ('the Company')

22 May 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:

Royal London Asset Management

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):

15 May 2007

6. Date on which issuer notified:

21 May 2007

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

3%

8. Notified details:


A: Voting rights attached to shares

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

GB00B0FVQX23   2,250,000  2.9737   2,300,000  2,300,000  N/A     3.0398   N/A


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
N/A          N/A         N/A           N/A                                N/A



Total (A+B)

Number of voting rights                % of voting rights

2,300,000                              3.0398

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:
N/A

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:
N/A

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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