DC,
I have heard a version of those events but whether it was Gander I cannot remember. When I was on 48 at Changi we had the ludicrous situation whereby the officers were on rates and the NCO aircrew on actuals.
It did not take the genius of Einstein to ensure that this cost the RAF far more than would have been the case if all had been on rates.
I did a trip out to Hong Kong and back and we took an accountant officer who ran the imprest. She was still trying to reconcile it weeks after we got back !