I also remember him blatting overhead from behind the crowd at nought feet in the B17 one year (can't remember where) and cranked it over so suddenly, it seemed to stop flying and 'hang' in the sky. It all looked scary to me at the time.
I remember Don Bullock flying the B17 at one of the Barton airshows, in the 70s IIRC. His low pass was so low that from my position, about 10 people back from the fence, all I could see was the top of the fin going past
SSD