Try Newton Ellis & Co. (www.newtonellis.com): a very good general repairer with whom I've always been satisfied. Note however their turnaround times can be variable and they're not cheap. Ring up and discuss your requirements.
I can only say good things about Dave Boyle at Camera Repair Workshop (Milton Keynes, 01908 378088).
Not sure if he works on the RD, but he's definitely worth a call.
Best regards
RoyM
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