DC10 man
Having spent 13 years in Bermuda I had never heard of that but I can well believe the BOAC crew especially immediately post ww2 with probably longish layovers, would be granted temporary membership of the Royal Bermuda Yacht club so I can see how the idea came about.. Probably only flight deck crew though as ladies were not allowed in the bar until about 1990.
I worked for Cable and Wireless for many years and if there were three things an imperial outpost , especially an island one, had to have it was Barclays Bank, BOAC, C&W