In the '70s there was a home made helo on a plinth outside a scrapyard near Sunbury on Thames. It's construction was vaguely reminiscent of a B47, it had a Triumph twin motorcycle engine and I think a Sunbeam motorcycle worm-drive back hub for TR Gearbox. Don't recall the MGB.
Doubt it had enough power to fly though, and its position in a scrapyard probably said it all. Anyone know more?