Incredible Edibles are one of my favourite grassroots, (literally) home-grown projects. Begun in Todmorden in Calderdale (North West England) by a group of volunteers who wanted to democratise gardening. It's taken off. People come from all over the world to Todmorden to see what they've done - vegetable tourism!
Here is one of the founders, Pam Warhurst, talking about what they've done:
What a way to transform the place you live.
To find out more here is their website https://www.incredibleedible.org.uk