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London Bike Kitchen might work for you (Edit: reading comprehension fail)
They also do 1-1 for £30/h which is a bit cheaper/more flexible than CTUK
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Youtube. Most bike stuff is covered pretty well. Parktool / MBR / GCN do some pretty good how to vids.
For obscure hubs you will probably find someone whos ripped one apart in a shed and is keen to show how to do it yourself. I watched a very boring Aussie and then a much more animated redneck before attempting a re-grease on an Alfine internal hub, although they are not that obscure.
To my shame, despite having ridden in London for a few years now, I barely know where to start maintaining/fixing my bike (this could also go in the 'I confess...' thread). I usually wait for a puncture, roll it to the shop, and get the drivetrain/brakes tightened up as part of that job. Then every now and again I pay for a service. My mechanical knowledge is basically zero.
I'd love to be able to service my own bike - but my commuter is pretty non-standard (auto hub gears, backpedal brake). So I can't really rock up to a beginner class where none of the lessons actually apply to my bike.
Where's the best place to learn to maintain a strange bike as a complete maintenance noob?
I know CTUK to bespoke sessions, which they seem to think are best in my situation, but they're pricey. I'm not counting them out, but anyone else got any ideas?