City Life had an article in its last issue about local activist groups.
I used to be a regular at Critical Masses. Nowadays my involvement tends to be slapping myself on the forehead on the last Saturday of every month in a Homer-ish D’oh! kind of a way. There isn’t a CM website listed in the article but ridemanchester, a collective dedicated to resurrecting abandoned bikes is mentioned.
And one of my own-
Manchester Environmental Resource Centre initiative (MERCi)