There are businesses here in Australia which caters for home brewers,if the business owner is not selling the beer he needs no license, the one close by to me has maybe 10 kettles, the punters go in, pay their money, pick out a recipe, gather up the ingredients, brew their beer, add the yeast and go back 2 weeks later (longer if it is a stronger beer) to bottle or can their beer.
The punter ends up with about 5 slabs, they can put up a swap, and while brewing can drink beer from stock for free and replace it when they can or bottle their own.
Obviously it is not an all grain brew, but I have called in a couple of times and it is a very friendly atmosphere with quite a few people milling around.
I personally didn't think it would catch on but it seems to be thriving and he has been there for 6 or seven years.
I don't know if U.K law would endorse it but I would be surprised if it didn't as the laws here and U.K seem to go hand in glove.