If your single engine wear an immersion suit,it may be uncomfortable but so is dying of hypothermia which you will get in uk waters within about 30mins even in the summer if your lucky/unlucky,aviation approved life jacket and an EPIRB one of which should have some sort of strobe on it, my opinion is that a raft is only any good if you have floats(i.e enough time to drag the thing out!) and do a dunker course,Andark of Southampton are very good and not to pricey if you get a few of you on a course.They will teach you all you need to know from a ditching point of view. Also make sure your AI is in good nick as it's not nice when the weather was like it was today over the Irish sea, 6 to 7k with a glass like watersurface,no horizon, makes you feel like your vis is much less,akin to been IMC, make sure the forecast/actual is good and any doubts go another day.
Otherwise go for it and chalk up another milestone of experience.
