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There aren't many vintage dealers left in London. Rick at New Kings Road Vintage Guitar Emporium is probably the only one who has any decent level of vintage stock, the other London dealers sell a bit of vintage along with new/used. There are still a couple on Denmark Street, NoTom who have some amount of vintage, Wunjo and Sixty Sixty Sounds have the odd vintage pieces now and then. Best avoid Music Ground (based at Andy's old shop) for aforementioned reasons.
Outside London ATB, Gary Winterflood (Guitar Avenue), Richard Henry and David Pym are all worth checking out.
A lot of David Pym's stuff is very, very clean. But I agree, you'll pay ALL the money for them.
ATB is well worth the visit, I was there last week and Mike has a 1957 dark back GT (P90s) that sounds like a jet plane taking off. Incredible sounding guitar. There was also an 1960 LP Custom that was cool (rebound fretboard though). Plus a load of cool, vintage ES guitars and tons of Fenders of various years (including the 1958 Sparkle Surf Burst Jazzmaster).
Mike's a great host, very generous with his time and knowledge and completely without the attitude you'll get at many of the Denmark Street shops.