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I've done sessions with Chase Skills (Cannock) and Aline (Sheffield). Probably not much use to you in London, but I would recommend some form of coaching. In my case, it was more a case of generally confirming that I had the basics right (which has been really good for my confidence), and also coming away with just a couple of tips to think about and work on. I also like the videos that GMBN (Global Mountain Bike Network) post up - they're in Facebook and YouTube.
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Jedi is in Herts. Check him out.
In terms of improving mtb skillzzzz, anyone have experience of the tutored sessions at the Olympic park or anything? Or better to just play around and learn on your own? I'd like to learn some good technique.