Taff Missed,The basic story behind Clavel's Whirlwind is true, and was performed by Bristow crews.
(I am quite sure all Brits know this, as it is so ballsy, I'd make sure it was repeated frequently if I were involved!). Alistair Gordon (Bristow #2 for many years) spun the tale for me about 20 tears ago at a dinner, and I have never forgotten.