Bromley Bike Co, my LBS, have been excellent to me. I've often asked for advice and they've let me watch how they do certain things, like fitting headsets so that I can do it in the future. They know that I'll come back for the essentials so whilst they may not get as much service £££ from me, they will on Park Tools and such.
Since this is about poor service, I have to mention these jokers at London Bridge:
Not only are their prices astronomical, feeding off the folks with too much money and not enough skill, but their workshop leaves a lot to be desired. I only use them if I absolutely have to and sadly I needed them a couple of weeks ago when I had some rear mech issues.
They replaced it but the set up was totally ****; slippage, skipping, grinding, you name it, it was going on. I had replaced the big ring, cassette and chain the week before so it had nothing to do with worn parts. After a horrible 12 miles home, I took it all apart and set it up properly; they'd messed about with cable length, stuck an extra 5 links into the chain along with another quick link but worse of all, added a spacer between the frame and rear cassette causing stress on the frame and bearing (hence the grinding). This was completely unnecessary, a total botch job.
I sent the spacer back to them in the post with a "polite" note asking that their workshop monkeys to be taken back to the zoo. I haven't had a response as yet.
AVOID AVOID AVOID