That said while I agree with covering the poor and helping the middle class substantially, I don't favor tax payers funding healthcare for people like Donald Trump, who are more than capable of paying for it themselves. That is why I don't support single payer.
That's not really an issue in the UK where we have the single payer NHS system. The service provided by the NHS is good but for those that want a 'de luxe' service with shorter waiting lists, and to get testing or treatments that are less readily available on the NHS we do still have private healthcare companies (the biggest being BUPA
http://www.bupa.co.uk/ ) People in the Donald Trump income bracket in the UK will almost certainly have this type of insurance.
I suspect that these insurance companies may well offer a better service for the equivalent price than those in the US because they have to compete against a free at the point of use service. I seem to recall recall that that was one of the arguments in favour of the 'public option' option during the Obamacare debate and I think that from an electoral point of view it was a big tactical mistake of the Democrats not to do this.
The NHS also has some minor means tested fees, such as the prescription charge which those on low incomes are exempt from paying. There's no reason why an expanded Medicaid for all system can't have the same.