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If you need more information about who to see and where to go, here are some links to other comedy sites that I've found quite fab...
fadetoblack.com
Stand-Up Comedy Game!!
comedyweb.co.uk
British Comedyweb - searchable reviews for comedians... check 'em out before you part with your hard earned cash!
comedyonline.co.uk
British Comedy site - News, reviews and free tickets to TV recordings... Bonus!
Evening Standard Site
As well as London's news, there's a comedy listings section for the London circuit.
Cragrats - Gagging for it Comedy Club
A place in Holmfirth, just over from where I live in Saddleworth. This one's just for folks that live near me...