I've just had a bathroom put in by Atanas at Big Small Building Solutions. He came up with some excellent design suggestions, and I have been very impressed at the level of detail in the finishing. He was comparatively very well priced, and his team were polite, tidied up after themselves and even worked Saturday and Sunday to get it done on time.
I found him recommended on the East Dulwich forum where there are plenty of other very happy customers. If you'd like to see his work, give me a shout.
You can get him at http://kitchenandbathroombuilderdslondon.co.uk/contact.html.