TR-1: Notifications of Major Interests in Shares

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

SOUND OIL PLC

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights

Yes

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached 

An event changing the breakdown of voting rights

Other (please specify):______________

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

Credit Suisse Securities (Europe) Limited

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

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

25/09/08

6. Date on which issuer notified:

29/09/08

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

8%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB00B09VL556

52,780,356

52,780,356

59,518,908

59,518,908

n/a

8.60%

n/a

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date 

No. of voting rights that may be acquired (if the instrument exercised/converted)

Percentage of voting rights

Total (A B)

Number of voting rights

Percentage of voting rights

59,518,908

8.60%

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

Credit Suisse Securities (Europe) Limited is a part of the Investment Banking division of Credit Suisse ("CSIBD"), which is part of the Credit Suisse Group ("CSG"). CSIBD is a segregated business unit within CSG with an independent management structure and exercises its voting rights independently from other divisions of CSG.

Proxy Voting:

10. Name of proxy holder:

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

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

13. Additional information:

14 Contact name:

Simon Crawley

15. Contact telephone name:

44 207 888 5416