I wonder are any offies big enough so offer home brew supplies too? Would be great to walk in to an off license and get some good beer, and supplies for your next batch.
Homebrewers will always buy beer as unless they have enough space and time, they will always have to wait weeks/months to drink their beer so still need something in the meantime... That and we all just enjoy good beer so it would not take business away from the off-license, on the contrary it would attract home brewers who would not normally go to that off license as it is not convenient.
It would be pretty handy when you realise you do not have enough DME etc to jump in the car and go get some.