I would recommend Roy Keable. We had our bathroom painted by another business recommended on Nappy Valley, and the work was fine (finishing could have been a little better), and I thought the charge was quiet high.
When we came to decorate more of house I sound Roy on Which Trusted Traders. Alan and Alex did a fantastic job of making good and painting 4 living areas in our Victorian house. Some of the original wood work needed detailed repair, and I'm thrilled with the result. They left the house tidy and fairly dust free each day. The prices was reasonable too.
Roy is based in West Norwood, we are in Battersea.