For example I'm sure there are people in the UK who have turned to the private sector for treatment and in doing so incurred debts which resulted in bankruptcy. But that's such an exceptional unusual concept I'd be surprised if it occurred more than a handful of times in any given year.

While I can believe there is somewhat higher variance in the US system in terms of bills/prices/etc, which sometimes affects people meaningfully, it's also worth pointing out that out of pocket costs aren't unusually high in the United States. I mean, we might have a slightly larger problem with these, but that's much more of an implementation detail in terms of who pays and how much than the sort of top-down policy proposals some people seem to believe are necessary (because they've badly misdiagnosed the situation or are ideologically blinkered)

https://randomcriticalanalysis.com/2019/12/03/no-means-no-th...

Some people may prefer a regime that offers more insulation (socialization) from the true costs (generally overstated IMO), but that's something of a different problem with different potential solutions than the popular notion that US prices are inexplicably high or outcomes inexplicably bad where we're (presumably) likely to win-win-win if only we copy the regimes found elsewhere.