Anybody in the UK...there's only really two to go to.
Tylden Reed and Chris Heal.
Tylden repaired and renovated my dead Oyster Date and is probably one of the only guys who can now service the watch (he was recommended to me by Rolex Bexley).
http://www.tyldenreed.co.uk/
Chris, I have not used yet but he is highly regarded and has always been professional, polite and prompt in our correspondence.
http://www.chealwatch.co.uk/
J