In the Howgate at the moment Recyke a Bike has taken over a shop for the Xmas period. In window at the moment is a Harry Quinn (Reynolds 501 frame with Shimano 600 fittings and Brooks saddle) racing bike from 1980s. Seems to imply all the stuff is original and they're asking £250.
Not sure how you'd contact them to make sure of no wasted journey but I suppose the Stirling place might be able to contact or give a mobile number for them? *Just contacted Stirling number (01786 447559) and they advised shop only open in Falkirk Thurs, Fri, Sat 10-4. So bike won't move before Thurs but if interested can phone Stirling + they'll reserve confirm details etc.
Just FYI. Sorry if this is waste of folks' reading time.