Thought it would be worth mentioning all the Transition Town initiatives starting up - I've been in touch lately with people in Stoke Newington and Highbury, but I know there are others around town including Brixton.
http://ttstokenewington.ning.com/
http://transitionhighbury.ning.com/
Post your links!
Transition Towns
Moderator: Peak Moderation
A Transition Westcombe started up recently, that's in the Blackheath/Charlton area in SE London:
http://transitionwestcombe.blogspot.com/
http://transitionwestcombe.blogspot.com/
"Things are now in motion that cannot be undone" - Good Ole Gandalf! 
"Forests to precede civilizations, deserts to follow" - Francois Rene Chateaubriand
"Forests to precede civilizations, deserts to follow" - Francois Rene Chateaubriand