Director/PDMR Shareholding

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

NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

Porton Down, UK, 23 July 2010: GW Pharmaceuticals (AIM: GWP) hereby provides notification that the Company has today been notified that Richard Forrest, non-executive Director, has today purchased 20,000 ordinary shares of 0.1p each at the market price of 109 pence per share. This purchase equates to 0.015% of the issued ordinary share capital.

Following this notification Richard Forrest's beneficial interest has increased to 60,000 ordinary shares, amounting to 0.046% of the shares in issue.

The total number of shares outstanding in the Company is 130,041,372 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