From reputation a pretty good truck mechanic/engineer , saw him helping to restore a spitfire a while back and one of the full time engineers wanted a wing pin turning down "to an exact fit" ,it had to fit through the joint ,wing to fuselage without force or loose ,when finished they were impressed with his work, however, the pin wouldn't fit , it had to be placed in a freezer and then slid in, the temp in the hangar had been enough to expand the pin.
I read about this wall of death record in his book "when you dead you dead " but missed it on TV. I agree with GB his voice is weird but......