lisad, did you miss the bit that visitors are already supposed to pay?
This isn't aimed at visitors, or even health tourists, but at people legally living in the UK who have migrated here. We don't have proper details about who this would actually affect.
So it could be people on employment visas who are paying (often higher rate) tax.
Spouses of UK citizens (who already have to show proof they are earning IIRC £18,000 to even get into the UK).
International students, from whom the UK makes a vast profit in fees and spends, and we often get to keep the brightest too.
It's quite likely to affect people working in the NHS, for heaven's sake.
We'd need to see the details to know. But it would be a huge admin job however it was done, very expensive to police, unlikely to recover full costs due to exemptions around A&E, etc, and to what end? To deprive your next door neighbour of healthcare. Yes, that's an aim I can really get behind.
It's a desperate piece of immigration-bashing politics to try to shore up a Tory party failing to compete with UKIP.