The used to be an engines school at Farborough before the war and apparantly when they closed it they buried all the obsolete First World War equipment. The predessessor to the RAF museum was run on the old-boy basis at Halton and they got wind of it. Somewhere they found an ancient Flt Sgt who remembered where they had been interred and the dug them up.
IIRC there was a Zeppillin power module and more interesting a BMW in line six. This one took only three days to get started and I believe is in their Fokker D7.