Back in the 60s, just before I started at the Thorney Island S&R flight, they were called out to 2 Hospital transfers, (both life threatening) and 1 sea-related. The visbility was given as never above 100m, rubbish cloud base, and the whole thing was navigated on Decca (remember it?). Decision making, in those circumstances, is almost at coin-tossing level.They were, in the event, successful but balance 'what could have been' against 'what was'.? How's your luck today?