London Skill Sharing and Sustainability Action group which is still searching for a more permanent title
More than just a talking shop this group is meeting formally every month or so with various activities and socials happening in-between times.
It is a well tooled up group committed to liberation of surplus land and support of threatened land across the metropolis.
Some groups involved include: Ecovillage Network UK - http://www.peoplefinder.org.uk
Join the mailing list: http://lists.riseup.net/www/info/ecoaction
Recommended reading to visit inspiring example projects across the UK http://www.diggersanddreamers.org.uk/