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I went through that recently. Annoyingly, after really trying to get mine through a shop, in the end I couldn't order the ones I wanted, as nobody distributed them in this country or in Germany with the exception of an eBay shop.
Basically, only a very few London shops still stock them, partly, I believe, because of that Sidi Café web-site. The only one I found in Central London was Fitzrovia Bikes. I recommend you order from them properly, because they're great guys and deserve your business. It won't be more expensive than through the web-site. We really have to support local bike shops rather than web-sites. 'Showrooming' is bad manners, too.
Which shops stock Sidi mtb's (i.e. Condor?) Want to try out the size before ordering online