This is worth reading:
Ditching Myths Torpedoed - equipped.com
Ditching in a fixed gear aircraft in the English Channel is
probably not going to kill you
in itself.
Protect yourself in the water and get quickly located are things to plan sensibly for, in the event a ditching occurs - so immersion suit (or dinghy) and GPS PLB as a minimum.
Plus a considered Mayday call ("I'm ditching. Here I am...") on the way down from your high-as-possible transit altitude will help a lot. As will landing close to a vessel, with which height and time will help find - I'm told by the RNLI that a yacht or ideally ferry (Manoeuvrable: Lots of eyes on board) is far better than a tanker or freight carrier.
Simply thinking "It's a SEP with fixed gear: I'm definitely dead if the engine stops" is not only demonstrably wrong, but fatalistic and could well guarantee a bad outcome if that's your view.
Pace, how does the SEP being a Cirrus help at all? It may actually hinder, given now no crash attenuation under the chute due to a crushing undercarriage.
Mary: It was/is G-WAVE.