Great that you met him an remember!
He did the gas survey for a good many years, looking at his logbooks sometimes 7 hours of flying a day.
Here's a shot of a bell 47 (he flew G2,3,4,5 variants between '77-'79)
Don't know the tail number of this one or the exact date but I'm guessing the trousers were a bet (or it was Rupert the Bear week
)