Can you clarify which aircraft you mean? I assume you mean 'The Flying Bedstead'?
As far as I can see, the pilots were:
XA314
Wg Cdr Harvey Heyworth
50th anniverary of death of Notts pilot John Harvey Heyworth | This is Nottingham
Captain Ron Shepheard
Did the first untethered flight
Flying Bedstead
XA426
Wg Cdr Henry Larsen (elsewhere Air Cdre)
The Glasgow Herald - Google News Archive Search
There is no mention of any being helicopter pilots. I thought Eric 'Winkle' Brown, who lists helicopters amongst types flown, had flown the flying bedstead, but can't find this on t'internet.