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In answer to Howard's point, it is the EHIC that would no longer apply to the UK, because the EU Regulations to which it belongs no longer apply. The Government could, in theory, replace those Regulations with individual arrangements with each country, but why would they? Why subsidise people's healthcare abroad when they don't have to? And even if they did, why should healthcare be covered in Spain, but not the US, for example? Why not Thailand? These are just the sorts of questions leave has not given an iota of thought to.
The worst suffering will be the hundreds of thousands of UK pensioners living in the EU. They would no longer have access to state funded healthcare at a time in life when they need it - and could not afford private care. Again, the Government could carry on funding healthcare voluntarily, but again, why would they for the same reasons as set out above.
I have made this point before, but there are so many detailed and significant points that go missed because the debate seems to be whether we dislike foreigners this much, or that much...