Eat your local park

After the election results, a promised "ambitious programme of pocket parks" will now be happening across the UK in the next few years. Is there potential there, perhaps, for some kind of 'edible planting' in some cases? Imagine a small pocket park planted up with the complete range of native edible plants. I mean away from main roads and cars. There are apparently a few such in London, but they're alongside main roads — where you really wouldn't want to pluck-and-nibble because of all the nasty gunk that comes off the vehicles.