I once had cause to go to a German hospital with what I subsequently found out was a perforated eardrum.
And guess what.
They wouldn't treat me until I could produce evidence medical insurance, an E111, or provide payment.
It's so easy.
It doesn't need any more bureaucracy or extra administrative staff to make it a compulsory requirement of entry to Britain, for everybody to be in possession of valid healthcare insurance, for the duration of their stay.
This could be checked with their passport or visa application and double checked, on arrival.
No doubt this would of course be 'racist' though.
However, ensuring they recover payment for medical treatment is something which other, more sensible countries less sensitive about political correctness, manage quite easily.
The wishy-washy liberal p.c. brigade would have you believe it only costs the nation a 'tiny' amount.
But their definition of 'tiny' is hundreds of millions of pounds a year.; which simply shows just how out of touch with reality they are.
It doesn't matter if it's one operation costing £100 a year, that's £100 too much; the WHS is not free, we pay for it and it's enough without having to pay the bill for freeloading, foreign visitors.
Any foreign visitor who is here, for any reason, must pay for their treatment.
Like they make us pay when we're abroad.