Thanks for the heads-up Velo, might be worth a wee trip in although I've got 29er tyres coming out the wazzoo.
Measured the Rockhopper last night, 22.5" C-T seat tube, and 22.5" C-C top tube. Feels like a pretty good fit to me. The dearhead is in not bad nick, although fair bit of surface rust on the canti bolts. Possibly weak spring on rear mech too. I've begain stripping it back to the frame, give it a good clean and treat the rust spots.
In terms of period amber walls - Spesh Ground Controls, Farmer Johns, Timbuk IIs - anything else I'm missing from that list?