I've been to Clandestinos supper club (and am going again soon).
http://www.clandestinos.co.uk/
My own Cuisine Cachée opens its door from time to time (next dinner celebrating Bastille Day)
http://www.cuisinecachee.com/2012/06/bastille-day.html
I don't know of anyone else nearby though. Are there any other local supper clubs going?
@CusineCachee, yes - in Crouch End there's www.cuisson.co.uk (aka Paul). I went to a demo he did at James Nicholas, and he's fab.
@vetski - I recently came across Paul's website and looks quite brilliant. Think I will give it ago.
Haven't actually looked at site yet! But did think he was a great chef and a lovely guy. IIRC, he used to work for G Ramsay - he seems to have come out of the experience unscathed, though. If you don't already, keep an eye on James Nicholas via Twitter - I was in there on Sat, and they said they were planning another demo, though whether by Paul or someone else they didn't say.
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