Notifications of Major Interests in Shares

TR-1: Notifications of Major Interests in Shares

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

Afren PLC

2: Reason for notification (yes/no)

An acquisition or disposal of voting rights

yes

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

no

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

no

An event changing the breakdown of voting rights

yes

Other (please specify):

no

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

obligation:

 Standard Life Investments Ltd

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

 Vidacos Nominees

5. Date of the transaction (and date on which the threshold

is crossed or reached):

2 October 2009

6. Date on which issuer notified:

8 October 2009

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

7% and 8%

8: Notified Details

Voting rights attached to shares

Class/type of share If possible use ISIN code

GB00B0672758

Situation previous to the triggering transaction

Number of shares

Number of voting rights

27,306,882

27,306,882

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

58,289,891

35,638,546

22,651,345

4.970%

3.159%

Qualifying 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

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

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

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

58,289,891

8.129%

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

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:

[email protected] Standard Life Investments Ltd

15. Contact telephone number:

(0131) 245 6565