Think a visiting tourist would be 'allowed' to use NHS if he was some sort of emergency. But he would be sent a bill to cover the costs (which he would then send on to his insurance).
My GP surgery uses the askmygp system, and if I think I need an appointment I use that to say what is wrong with me, etc. If the triage then thinks it necessary I will be phoned with an appointment later that day.
Recently had my follow-up appointment at the sleep clinic for the review of my usage of my CPAP machine after eight weeks. Arrived for this very late (not my fault, due to being let down by hospital transport). Clinic had been informed, and I was still able to have a one-to-one with the Consultant for a good twenty minutes. Totally NHS, no way could I afford anything else.
we really do need to defend the NHS - it is still so very underfunded for this day and age, a few pennies extra on income tax could solve this and most people surely would be happy to pay this to have a fully functioning NHS returned to us.