This may be relevant to those considering crossing if you havent already read it.
http://www.caa.co.uk/docs/33/SRG_GAD_WEBSSL21.PDF
It seems to strongly support the idea of carrying a raft. I have spent many years skiming across the channel - and even though SAR are very good in the channel - you need to plan on 2hr+ to be rescued mid channel.
Therefore I now always carry a raft. Having said all that I have not come across any actual evidence to support the theory. AND I have not actualy practiced escaping from a plane (probably injured) and then climbing into a raft. I have done it in a boat and upside down in a car and it is not easy.
Does anyone know if such simulations exists for the non military or oil rig types?