Apparently NHS takes everyone who presents at the doors. A year ago an ex-pat Brit friend was in UK for his mother's funeral. A night or two into the trip he had some acutely painful but not lethal symptoms. Off the the nearby hospital. 'Oh yes, Mr "Smith" do you still live at 123 Bumbleberry Lane?" That hasn't been his address since his adult children were in school, but knowing how to keep his mouth shut, he said nodded and mumbled. "Over there please, have a seat and someone will see you." He was treated by NHS not once but three times! without being a British resident for decades.