Appointment of Piper Jaffray as Nominated Advisor and Broker

Appointment of Piper Jaffray as Nominated Advisor & Broker

1 December 2009

Porton Down, UK, 1 December 2009 - GW Pharmaceuticals plc (AIM: GWP) is pleased to announce the appointment, with immediate effect, of Piper Jaffray Ltd as Nominated Advisor and broker to the Company.

For further information please contact:

GW Pharmacueticals +44 (0)20 7831 3113
Dr. Geoffrey Guy, Executive Chairman / Justin Gover, Managing Director

Piper Jaffray Ltd +44 (0)20 3142 8700
Neil Mackison / Rupert Winckler

Financial Dynamics +44 (0)20 7831 3113
Ben Atwell / John Dineen

Notes to Editors:

About GW Pharmaceuticals

GW Pharmaceuticals was founded in 1998 and listed on the AIM, a market of the London Stock Exchange, in June 2001. Operating under license from the UK Home Office, the company researches and develops cannabinoid pharmaceutical products for patients who suffer from a range of serious ailments, in particular multiple sclerosis and cancer pain. GW has assembled a large in-house scientific team with expertise in cannabinoid science as well as experience in the development of both plant-based prescription pharmaceutical products and medicines containing controlled substances. GW occupies a world leading position in cannabinoids and has developed an extensive international network of the most prominent scientists in the field. For more information, visit www.gwpharm.com