There are two shops local to me that I like - Dive 69 in Ewell; who've given us really good service in the past; and Amphibian in West Norwood who I've only just started using but like a lot and has cheaper nitrox. That gives me a dilemma - which LDS to support?
I'll probably alternate between the two.
Incidentally, I think there are quite a few YDers using these two shops - 69 I know a few people use, and when I was signing the nitrox book at Amphibian the other day I recognised a couple of names!
Least favourite? There are a few I wouldn't go back to out of choice, but none that have been horrendously bad. Even go-dive, who I've always been relatively happy with - never had a problem that requires customer service though.