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

ENCORE OIL PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

CREDIT SUISSE GROUP AG

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

CREDIT SUISSE SECURITIES (EUROPE) LTD

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

01.12.09

6. Date on which issuer notified:

02.12.09

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

5%

8. Notified details:

A: Voting rights attached to shares

Class/type of
shares

if possible using
the 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

% of  voting rights

Direct

Direct

Indirect

Direct

Indirect

ORD

GB00B06KL332

15,785,006

15,785,006

N/A

N/A

Not Reportable

N/A

Not Reportable

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrument

Expiration
date

Exercise/
Conversion Period

Number of voting
rights that may be
acquired if the
instrument is
exercised/ converted.

% of voting
rights

N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments ^{xv, xvi}

Resulting situation after the triggering transaction

Type of financial
instrument

Exercise price

Expiration date

Exercise/
Conversion period

Number of voting rights instrument refers to

% of voting rights

N/A

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Not Reportable

Not Reportable

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

1. Credit Suisse Group AG
2. Credit Suisse

            2.1. Credit Suisse Securities (Europe) Ltd

Proxy Voting:

10. Name of the 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/Carolyn Collins

15. Contact telephone number:

+44 (0) 20 7888 0241