Graeme,
Welcome to the forum. That's a great bike to start with, nearly complete and not rusting into the ground. I think your uncle will be or, maybe, would have been, proud to see the results when you get there. Looking forward to many pictures in process. I have a hunch you will do more restoration than you think between strip-down and reassemble for "rolling restoration." It just seems to be the way it goes.
Richard L.