Enquest Regulatory News (ENQ)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

EnQuest 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 thenotification obligation: iii

Lorito Holdings (Guernsey) Limited & Zebra Holdings and Investments (Guernsey) Limited both of 1st & 2nd Floors, Elizabeth House, Les Ruettes Brayes, St Peter Port, Guernsey GY1 1EW

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

N/A

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

17th February 2011

6. Date on which issuer notified:

18th February 2011

7. Threshold(s) that is/are crossed orreached: vi, vii

9% (Article 9 of Directive 2004/109/EC)

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary

65'047'200

&

13'000'000

65'047'200

&

13'000'000

61'000'000

&

10'350'000

61'000'000

&

10'350'000

Nil

8.9247 %

Nil

GB00B635TG28

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

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

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

71'350'000

8.9247 %

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

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

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

N/A

13. Additional information:

Notification is based on a total voting rights figure of 799,462,905.

Lorito Holdings (Guernsey) Limited holds 61'000'000

EnQuest shares

Zebra Holdings and Investments (Guernsey) Limited holds 10'350'000 EnQuest shares

14. Contact name:

Paul Waters

Company Secretary

15. Contact telephone number:

+44(0)20 7925 4900