SLE.L Regulatory News (SLE)

13 May 2010

San Leon Energy plc

("San Leon" or the "Company")

Additional Listing

Further to the announcement on 11 May 2010 by Island Oil & Gas plc ("Island") that the High Court had sanctioned the Scheme of Arrangement under which, inter alia, San Leon will acquire Island, the Company announces that application has been made for the admission to AIM of 63,591,295 new ordinary shares of €0.05 each in the Company ("Ordinary Shares"). The new Ordinary Shares will rank pari passu with the Company's existing issued ordinary shares and dealings are expected to commence on 14 May 2010.

Following Admission, the Company's enlarged issued share capital will comprise 385,798,585 ordinary shares, with voting rights. The Company does not hold any ordinary shares in treasury. Therefore the total number of ordinary shares in the Company with voting rights is 385,798,585, which figure may be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change in their interest in, the share capital of the Company under the FSA's Disclosure and Transparency Rules.

For further information, please contact:

San Leon Energy plc +353 1291 6282

Oisin Fanning, Chairman

Philip Thompson, Chief Executive Officer

Arbuthnot Securities Limited 020 7012 2000

Nick Tulloch/Alasdair Younie

END