Yep, nothing against that. Unfortunately it's just too simplistic and unstrutuctured.
How much cash? what's the cap?
I have more than a couple of friends who have returned to UK virtually penniless after spending all their savings on medical issues so the wife would end with nothing in a worst case outcome.
I'm sure we've all heard the stories of those couples where one spouse could not renturn to UK as ILR had lapsed and no British Citizenship.
My own view is that a multi-structured approach to healthcare needs to be considered. Probably with some pretty strict agreed guidelines on the use of cash/credit cards.
A friend of ours needed a heart operation followed by pacemaker fitted.
As I recall it cost around P1mill from begining to end.
He was told it will need to be replaced in 5 years.
I've told my wife to be sure she gets a shovel and a box