I was in Corsica for the last two weeks and failed to see anyone wearing a kill cord or lifejacket the whole time I was there.
Even at the Rib rental place I looked and no one wore one. Even in the brochures they had, no Kill Cord or Life Jacket !
I must have been the only person wearing a LJ in the whole place. Either its the heat or slack attitude to H&S.
Mind you, I rode my motorcycle to the marina every day in shorts, tee-shirt and sandals. You wouldn't do that in the UK but you have the same risks.