best value good carwash in London?

[tgr]

I've read the hosepipe ban thread. Hmmmm.

I'm not talking about detailing which is a whole different ballgame. Where can I get my car cleaned by people who will take care rather than scrub it with a gritty rag?

Clearly if money and time were no object I'd be laughing but who will be able to do this job at a reasonable price? Any recommendations? Thanks!