Nigel
Apocrypha are statements or claims that are of dubious authenticity.
I think that this is one of them. I have never heard of it - does not mean it did not happen, but as I may have my faults, being wrong is not one of them.
There was a Hiller 12 E accident, I think on Goonhilly Down, where the crew flew unharmed through the bubble in their seats after an 'interesting' landing. Happy days.