Here is a list of useful links:

http://clear-uk.org/

CLEAR Cannabis Law Reform, the UK's largest membership-based cannabis policy group. CLEAR campaign for medicinal cannabis on prescription and regulated access for adults.

http://www.marijuana.com/
Marijuana.com is the leading cannabis related message forum and news site.

http://www.cannabisnews.com/
Informing the public about cannabis

http://www.nhs.uk/livewell/drugs/pages/cannabis-facts.aspx
Cannabis - The facts

http://petition.parliament.uk/petitions/104349
Petition - Make the production, sale and use of cannabis legal.

http://www.potsmokersnet.com/
Potsmokersnet.com. We are a World Wide list of the best 420 sites on the planet.