Holding(s) in Company

Sound Oil PLC
23 April 2008


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:

SOUND OIL PLC

(2) Reason for the notification (please state 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: (NO)

An event changing the breakdown of voting rights: (NO)

Other (please specify): (NO)

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

CREDIT SUISSE SECURITIES (EUROPE) LIMITED

(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):

18 April 2008

(6) Date on which issuer notified:

22 April 2008

(7) Threshold that is crossed or reached:

8%

(8) Notified details:

A: Voting rights attached to shares
+-------------+---------------------+-----------------------------------------------+
|Class/type of|Situation previous to|                                               |
|             |the                  |                                               |
|shares       |Triggering           |   Resulting situation after the triggering    |
|             |transaction          |                  transaction                  |
              +----------+----------+----------+-------------------+----------------+
|if possible  |          |Number of |          |                   |                |
|use the      |Number of |Voting    |Number of |Number of Voting   |                |
|ISIN code    |Shares    |Rights    |Shares    |Rights             |% of voting     |
|             |          |          |          |                   |rights          |
+                                   +----------+----------+--------+-------+--------+
|             |          |          |Direct    |Direct    |Indirect|Direct |Indirect|
+-------------+----------+----------+----------+----------+--------+-------+--------+
|ORDINARY     |57,360,697|57,360,697|52,780,355|52,780,355|n/a     |7.6225%|n/a     |
|SHARES       |          |          |          |          |        |       |        |
|             |          |          |          |          |        |       |        |
|GB00B09VL556 |          |          |          |          |        |       |        |
+-------------+----------+----------+----------+----------+--------+-------+--------+



B: Financial instruments
+---------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                             |
+-------------------+-------------+---------------+---------------+---------------+
|Type of Financial  |Expiration   |Exercise /     |Number of      |% of voting    |
|Instrument         |Date         |Conversion     |voting rights  |Rights         |
|                   |             |Period /       |that may be    |               |
|                   |             |Date           |acquired is the|               |
|                   |             |               |instrument is  |               |
|                   |             |               |exercised /    |               |
|                   |             |               |converted      |               |
+-------------------+-------------+---------------+---------------+---------------+
|N/A                |             |               |               |               |
+-------------------+-------------+---------------+---------------+---------------+

Total (A+B)
+-----------------------------------+--------------------------------------------+
|Number of voting rights            |% of voting rights                          |
+-----------------------------------+--------------------------------------------+
|52,780,358                         |7.6225%                                     |
+-----------------------------------+--------------------------------------------+

(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 the proxy holder:

(11) Number of voting rights proxy holder will cease/acquire to hold:

(12) Date on which proxy holder will cease/acquire to holding voting rights:

(13) Additional information:

(14) Contact name:

GLENDA BURFORD

(15) Contact number:

[phone]





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