A raft is the only way that makes sense. It is a small package, under 10kg, which lives on the back seat (in easy reach of the pilot if flying alone) and it gives you a chance.
nah you would be better with a 10kg yellow brick for the pool with a bit of red string stuck on it, that has "Life raft" stenciled on the side. Then the local PPL police think you have listened to them.
The reduction in heckling and abuse in the bar thus reducing the stress level before flight. Will have more of increase in safety than having a beacon, life jackets, inflatable boat, seat belt knife, dry suit, back up ICOM,backup back up ICOM with VOR thingy on it, and all that other pish they would have you carry. Its developed it an arms race of who can out safety each other. As soon as everone has the kit some pillock finds something else to up the anti.
20 quid/ crate of beer spent getting an engineer to take the cowls off, check the plugs and compressions. Would be far better money spent IMHO.
Apart of course from a GPS