Correct Andy, it's a 1940 Riley 12HP. Not been on the road since 1970.
I have been asked to document the car on behalf of the definitive originality database for the marque as it is unusually original, so I will pop a few on here when I have fulfilled the request.
My dilemma now is: restore, preserve, or sell? Heart says preserve but make it safe and use it; my head says sell. My wallet says that I would get very little for it which may be a deciding factor.