Speak with Andy at Andark Diving
Dunker he's a good friend and has got a Scout Helicopter incredibly wonderful genuine guy with a great bunch of instructors.
Regarding "goon" suits or dry bags.... then this is all down to water temp and how far offshore you are going....
There is not many reports of life rafts being pulled from the aircraft if its in the baggage area or not easily accessible - remember if you ditch in a low wing single you ideally want to get as close to the stall as possible just above the wave tops, and depending on wind direction, swell and tide will depend on the outcome....
Bottom line is if you "Ditch" under control in a standard single in Europe and you've managed to get a call out on 121.5 stating intentions to ditch then odds are that the SAR helicopter will be with you before you actually get wet.
From November through to June I would ALWAYS wear a goon suit in Europe due to water temp and survival time. From July till October Id be happy with just a lifejacket in Europe waters.
Hope that helps