I recall that at Stradishall , when it was the home of 1ANS in the late 1960s, the staff navigators , when carrying out continuation training, used often to go to Machrinish. For some reason these exercises were called "Fish Runs".
I also remember Oysters from St. Mawgan. Where the pilot was allegedly briefed to fly at a height where there was sufficient oxygen to keep the little beauties alive.