I want to do something but I just don't know what?!
Are there any active UK groups working on this at the moment?

Welcome! - The Legalise Cannabis Alliance UK

The UK Cannabis Internet Activists Website: Website of the Legalise Cannabis UK Campaigns. Cannabis Information and UK Cannabis, UK campaigning for hemp, marijuana , cannabis.

Ya-Hooka; CommUnity/UK

How to get Cannabis Legalised: The Hempire - [cannabis, hemp]