So, FINALLY finished off the roll of film and put it in to be processed, I knew the camera lens and internal mirror were pretty dirty, but toward the end of the roll it would no longer progress forward to the next section, and at about picture 20 it spooled back about 7 pictures. So I took it in the picture I was most wanting was light damaged )-: and the rest weren't really viable, full of grain.

Since it's dead, I'll try and pull it apart now and restore it, though there are plenty of fiddly bits in there and I don't have the steadiest of hands.