All aircrew underwent rigorous sea survival drills before starting their tour. Thereafter deterrent crews were too precious to risk losing any due to illness or injury.
Very occasionally a very small number took part in realistic survival training where they
The rest of the crews were given regular briefing on conduct after capture and a day time only practice in setting up for land survival. As this was more akin to a picnic I am forbidden of saying any more.
I remember one briefing in 1972 where the CSRO was given some stick, sorry Robin.