Hi all,
Thanks again for your help with ID'ing this 1987 Raleigh (8 months ago!).
I've just starting working on it again. Having (finally) got the BB out, I weighed the bare frame at 2045g. Based on my internet searching that seems to indicate a 531c. There is some evidence of yellow paint inside the headtube, which tallies with a model in the 1987 catalogue.
The fork is a 1990-stamped hi-ten Spinner (770g), so I'll look to replace that.
I've got a 7 speed RSX groupset from 1995 and some Dura-Ace brakes which I plan to put on it. As a child of the 90's I just cannot get on with downtube shifters (how are so many of you old school road riders still alive??).
I know this stuff doesn't "really" matter, but I might sell it in future (I have too many bikes) and I wouldn't want to mislead a buyer.