http://www.taperecorder.co.uk
He's outside Ipswich, he's sort of like the Rob Schofield of Revox: I've just had mine in for a slight glitch on the speed and recalibration, well worth the money. Of course, I had to take a Broads holiday so that I could deliver by hand - no careless couriers for my Revox!
He obviously makes a good living out of it, a certain generation of rock stars wouldn't be without one.