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owl-
http://www.jrplumbinglondon.co.uk/
JR plumbing was recommended to me before by someone here, I think it was @andyp? Never personally used them but I have spoken to them in a couple of hairy situations and they sounded reasonably priced. Reason for not having gone for them is purly because I have always managed to twist a mate's arm who usually works in North London at the 11th hour.
ExTra
I've used this guy and he turned up on time and seemed to know his stuff http://www.full-flame.co.uk/
Not sure how SE he covers though.