Not heard of one here but I have a little house on the Calder river in Todmorden, the small west Yorkshire town where it all started about five years ago.
An initiative begun by two local women with no prior experience of organising anything much beyond their own households, it has since - literally - blossomed worldwide.
The principle is to commandeer underused public land (council/waterway/railside/whatever) and plant veg, which anyone can pick for free. The scheme now includes eggs and other produce but is still run just about solely by volunteers.
You can see the basis of it as soon as you step off the train. Planters at the station contain all manner of herbs, which you can just snip at and take home to use in that night's dinner. (Or tea, if we're being northern about it - they'll have had their dinner hours before...)
It's great: Incredible is the right word. Sadly I won't be spending much time there any more as I'm about to rent the place out (my flat here too) and move to Devon.
Could it transfer easily to an urban environment, though? I'll leave that for discussion!
Oh Boroman that sounds absolutely lovely..and teatime to me is in the evening too..lol an old cockney!
Trying to visualise it being here in central london, my soppy daughter was paying fortunes on rosemary until I pointed out that it was growing outside Tescos at surrey quays..and the pretty blue shrub growing in the garden was one and the same!