TMX group

LONDON, UNITED KINGDOM -- Heritage Oil Plc (TSX:HOC)(LSE:HOIL), an independent upstream exploration and production company, announces that on 13 May 2011 it purchased 203,055 Ordinary Shares to be held in treasury at an average price of 230.9742 pence per share (with a price range of between 230.5 and 231 pence per share). Following this purchase, Heritage Oil Plc holds 1,853,055 Ordinary Shares in treasury, and has 286,427,875 Ordinary Shares in issue (excluding treasury shares) as well as 2,953,508 exchangeable shares of no par value of Heritage Oil Corporation each carrying one voting right in Heritage.

The total number of voting rights in Heritage, excluding treasury shares as at 13 May 2011 is 289,381,383.

The above figure (289,381,383) may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Heritage under the FSA's Disclosure and Transparency Rules.

Notes to Editors

• Heritage is listed on the Main Market of the London Stock Exchange and is a constituent of the FTSE 250 Index. The trading symbol is HOIL. Heritage has a further listing on the Toronto Stock Exchange (TSX:HOC).

• Heritage is an independent upstream exploration and production company engaged in the exploration for, and the development, production and acquisition of, oil and gas in its core areas of Africa, the Middle East and Russia.

• Heritage has a producing property in Russia and exploration projects in the Kurdistan Region of Iraq, the Democratic Republic of Congo, Malta, Pakistan, Tanzania and Mali.

• For further information please refer to our website, www.heritageoilplc.com.