That bar tape's gotta go!
Despite being all stickered up as a Mercian, I don't think it is - although it does appear to have Mercian-built Mavic wheels! There's more pics on my Photobucket account
It's got a shimano 600 gearset and dura ace brakes, and overall seems a very nice ride.
The seller didn't advertise it as a Mercian so I'm not bothered about that, but it would be nice to find out what it is and what its age is. I haven't got as far as checking the date codes on the components, but I'm guessing by the 600 stuff that it's mid to late 70's, which could make part of the frame number (7593) being a date code?
It may also have had a respray at some point, and it's running 700c wheels so the fork may not be original.
I have checked with Mercian: the guy in the shop thought the seat lug wasn't quite right and the number didn't look like one of theirs, but he sent the details over to the office just in case, not heard anything since.
As long as it's nothing too historic (well, one can hope, can't one?) i think I'm gonna look at extending the gear range a little, though if it's a uniglide block as I suspect, this might involve a new back hub or even wheel.