Grant of Options

29 June 2010

Synairgen plc ('Synairgen' or the 'Company')

Grant of options

On 28 June 2010 Iain Buchanan, Non-executive Director of Synairgen, was granted options over 212,765 ordinary shares in the Company under the Synairgen Qualifying Non-Employee Share Option Plan 2009 at an exercise price of 23.5 pence per share, representing approximately 0.36 per cent. of the issued ordinary share capital of the Company.

For further information, please contact:

Synairgen plc Tel: + 44 (0) 23 8051 2800

Richard Marsden, Chief Executive Officer

John Ward, Finance Director

Matrix Corporate Capital Tel: + 44 (0) 20 3206 7000

Alastair Stratton

Anu Tayal