by

PTTEP AFRICA INVESTMENT LIMITED

(“PTTEP AI”) (a wholly-owned subsidiary of PTT Exploration and Production Public Company Limited)

for

COVE ENERGY PLC

(“Cove”)

PTTEP AI announces that, by means of an offer document dated and posted on 1 June 2012 (the “Offer Document”) and by means of this notice, given in accordance with section 978(1)(c)(i) of the Companies Act, PTTEP AI is making a recommended cash offer (the “Offer”) to acquire all of the issued and to be issued share capital of Cove. Terms defined in the Offer Document have the same meanings in this notice.

UBS, exclusive financial adviser to PTTEP AI, has confirmed that it is satisfied that sufficient resources are available to PTTEP AI to satisfy in full the cash consideration payable by PTTEP AI under the terms of the Offer.

Subject to the Offer becoming or being declared wholly unconditional, each Cove Shareholder who validly accepts the Offer will receive 240 pence in cash for every Cove Share.

The full terms and conditions of the Offer (including details of how the Offer may be accepted) are set out in the Offer Document and, in the case of certificated shares only, the Form of Acceptance accompanying the Offer Document. Cove Shareholders who accept the Offer may rely only on the Offer Document and the Form of Acceptance, in the case of certificated shares only, for all the terms and conditions of the Offer.

The Offer is, by means of this notice, being extended to all persons to whom the Offer Document may not be despatched who hold, or who are entitled to have allotted or issued to them, Cove Shares. Such persons are informed that copies of the Offer Document and the Form of Acceptance are available for collection from the offices of UBS at 1 Finsbury Avenue, London EC2M 2PP and also, subject to certain restrictions relating to persons resident in Restricted Jurisdictions, will be available on PTTEP’s website at www.pttep.com and Cove’s website at www.cove-energy.com while the Offer remains open for acceptance.

The Offer, which has been made by means of the Offer Document and this notice, will initially be open for acceptance until 1.00 p.m. (London time) on 22 June 2012 (or such later time(s) and/or date(s) as PTTEP AI may, subject to the rules of the Takeover Code, decide).

The Cove Directors, who have been so advised by Standard Chartered, have stated that they consider the terms of the Offer to be fair and reasonable. In providing advice to the Cove Directors, Standard Chartered has taken into account the commercial assessments of the Cove Directors. The Cove Directors have unanimously recommended that Cove Shareholders accept the Offer.

Unless otherwise determined by PTTEP AI or required by the Takeover Code and permitted by applicable law and regulation, the Offer will not be made, directly or indirectly, in or into, or by the use of the mails of, or by any means or instrumentality (including, without limitation, by mail, telephonically or electronically by way of internet or otherwise) of interests or foreign commerce of, or by any facilities of a national, state or other securities exchange of any Restricted Jurisdiction, and the Offer may not be accepted by any other such use, means, instrumentality or facility from or within any Restricted Jurisdiction. Accordingly, unless otherwise determined by PTTEP AI or required by the Takeover Code and permitted by applicable law and regulation, this notice is not being, and must not be, directly or indirectly, mailed or otherwise forwarded, distributed or sent in, into or from any Restricted Jurisdiction. All persons receiving this notice (including, without limitation, custodians, nominees and trustees) should observe these restrictions and any applicable legal or regulatory requirements of their jurisdiction and must not mail or otherwise forward, send or distribute this notice in, into or from any Restricted Jurisdiction.

Each of the PTTEP AI Directors and each of the PTTEP Responsible Persons accepts responsibility for the information contained in this notice other than that relating to the Wider Cove Group, the Cove Directors and their close relatives and related trusts and companies. To the best of the knowledge and belief of the PTTEP AI Directors and the PTTEP Responsible Persons (who have taken all reasonable care to ensure that such is the case), the information contained in this notice for which they accept responsibility is in accordance with the facts and does not omit anything likely to affect the import of such information.

The Cove Directors accept responsibility for the information contained in this notice relating to the Wider Cove Group, the Cove Directors and their close relatives and related trusts and companies. To the best of the knowledge and belief of the Cove Directors (who have taken all reasonable care to ensure that such is the case), the information for which they accept responsibility is in accordance with the facts and does not omit anything likely to affect the import of such information.

UBS, which is authorised and regulated in the United Kingdom by the Financial Services Authority, is acting exclusively as financial adviser to PTTEP and PTTEP AI in relation to the Offer and no-one else and will not be responsible to anyone other than PTTEP and PTTEP AI for providing the protections offered to clients of UBS or for providing advice in relation to the Offer or the contents of this notice or any transaction or arrangement referred to herein. UBS does not accept any responsibility whatsoever to any person other than PTTEP or PTTEP AI for the contents of this notice or for any statement made or purported to be made by it or on its behalf in connection with the Offer. UBS accordingly disclaims all and any liability whether arising in tort, contract or otherwise which it might otherwise have in respect of this notice or any such statement.

Standard Chartered, which is authorised and regulated in the United Kingdom by the Financial Services Authority, is acting exclusively for Cove and for no one else in connection with the Offer and will not be responsible to anyone other than Cove for providing the protections afforded to clients of Standard Chartered nor for giving advice in relation to the Offer or any matter or arrangement referred to in this notice.

Cenkos Securities plc, which is authorised and regulated in the United Kingdom by the Financial Services Authority, is acting exclusively for Cove as nominated adviser and broker and is not acting for or advising any other person and accordingly will not be responsible to any person other than Cove for providing advice in relation to the contents of this notice. Neither Cenkos Securities plc nor any of its affiliates owes or accepts any duty, liability or responsibility whatsoever (whether direct or indirect, whether in contract, in tort, under statute or otherwise) to any person who is not a customer of Cenkos Securities plc in connection with this notice, any statement contained in this notice or otherwise.

1 June 2012