Try and get hold of a copy of Paul Sheldon's excellent tome:
A RECORD OF THE R.A.C. BRITISH HILLCLIMB CHAMPIONSHIP 1947-1994
This covers all the rounds in that period and is pretty accurate.
Unfortunately no one has taken on the task of putting all this on the INTERWEB, Pretty poor show really. I would have thought those nasty little swots from the Midlands would have got round to doing it by now but like Abigail's master I think they are a bit lazy!
PS the British Sprint Championship results on
www.britishsprint.com took me mearly 18 months to get to the state they are in now