GWP.L Regulatory News (GWP)

GW Pharmaceuticals PLC ("GW Pharmaceuticals" or the "Company")

NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

Porton Down, UK, 8 September 2010: GW Pharmaceuticals (AIM: GWP) hereby provides notification that the Company has today been notified of the following series of share transactions entered into by Dr Geoffrey Guy, a Director and Executive Chairman of the Company.

On 3rd September Dr Guy transferred 8,660 ordinary shares of 0.1p each, equating to 0.01% of the issued ordinary share capital of the company, into his personal pension scheme. Dr Guy also sold 1,326 ordinary shares of 0.1p each, equating to less than 0.01% of the issued ordinary share capital of the company, at the market price of 103 pence per share. On 6th September Dr Guy sold 25,000 ordinary shares of 0.1p each, equating to 0.02% of the issued ordinary share capital of the Company, at the market price of 101 pence per share. Dr Guy has today transferred a further 4,850 ordinary shares of 0.1p each, equating to less than 0.01% of the issued ordinary share capital, into his personal pension scheme.

Following this notification Dr Guy retains a beneficial interest in 18,325,115 ordinary shares, amounting to 14.07% of the shares in issue. The total number of shares outstanding in the Company is 130,210,209 ordinary shares of 0.1p each.

For further information, please contact:

GW Pharmaceuticals PLC +44 (0)1980 557 000

Adam George, Company Secretary

Piper Jaffray Ltd (Nominated Adviser)

Neil Mackison/Rupert Winckler +44 (0) 203 142 8700