I always take the Cap Gris route to minimise the risk at max height.
I also carry out mental risk assessments (written ocassionally)and stop short of immersion suits and dinghy. Lifejackets and ELB are my personal answer. If I did manage to survive the ditching I would be Peed off if I couldn't float and bleep.
But if you are a "survivalist" and insist on wearing a bloody uncomfortable Immersion Suit surely you should also have a parachute.
The I.S. will only be of use if you manage to get out of the aircraft and into the water alive.
Evacuation prior to HITTING the water would address the first risk, staying alive in the water would be the second, and recovery the third.
I have chatted with guys nervous about the Channel hop but think nothing about transitting the Wash or Thames Estuary or even the Welsh Mountains!... strange.
Mind you with the present weather I think we'll all need immersion suits soon
