I could trade stories about experiences with UK and US healthcare (I've lived in both countries), but the facts speak for themselves. The UK and US are near opposite ends of the scale of healthcare expenditure per capita in the developed world, yet the average life expectancy is about the same.

I am not defending either system - I would strongly prefer something like the rest of continental Europe, which is a pragmatic mix of private and public healthcare. However, the idea that fully-public healthcare (a unique experiment in the world) is a sustainable model is a joke. It's hard to defend, when our current standard healthcare at the point of service could charitably be called "usually better than the 3rd world".