Just one minor fly in the ointment with ditching, which seems to be gleefully ignored or glossed over, especially in our climate is hypothermia.
Just how long is the survival time for an exposed body in the North Atlantic, Irish Sea or North Sea, even when equipped with a life jacket. From (very dusty) memory, in summer it might stretch to a couple of hours, but in this season of the year it comes down to a few minutes, so I guess that your whistle and light are just there to keep you entertained as you freeze to death......
