.NHS treatment is not based on citizenship, but rather on residential basis. But good for him that he has been able to access. If he told them he was a resident in Thailand they would refuse treatment, or charge him.
BeachDude for me it was the 800k. The opportunity cost of that is huge over 5 years. Say 4% compound interest for 5 years is a significant chunk of money.
As I have said before, I'm not that bothered. I can open a bank account in my wife's name and just pay for things via that. I'm going to get a cheap phone in her name and put the app on there so I can use for qr payments etc.
Thanks to everyone for their advice. As we are flying from Saigon, extra baggage is pretty cheap. We are probably only paying 350 dollars in excess baggage.
I can't get a Thai bank account on DTV. It is not possible. So I suspect it will be hard to assess tax liability without this. I'll just have to live off my wife