If you were born in the UK and have proof, ie , birth certificate it doesn't matter whether you've paid NI or not, you are entitled to treatment. All you need is your National Insurance number to prove to the system who you are. Also you should have a NHS Number, which I presume goes with your NI number.
If your a British citizen and regardless of how long you've lived abroad, coming back to live in the UK you are entitled to emergency treatment, be it hospital or at a GP surgery. Having said that if you require emergency treatment your going to need a hospital not a GP surgery. Also after you register with a GP surgery, as I believe if you see a doctor and it's not for emergency treatment, supposedly you have to pay a charge, plus pay for prescriptions. Now I came back to the UK after 15 years living abroad. At first I stayed at my niece's home and just went into the GP surgery she uses. Asked if they had any places, was told they had. All I had to do was show id drivers licence or passport, or a letter from the DWP with my name and my niece's address. Job done, straight back into the system.
Would I be right in assuming your from the UK and if so do you know if you have to provide evidence of a return ticket when you apply for a METV from London? If you want to utilise a METV to the best, ie., nine months, a return ticket, unless you buy one that gives you the option of date change, you gonna lose a fair bit of money. In times gone buy, I used to buy one year open returns, but sadly no airlines offer this anymore.
Rethink my trip? What makes you think I'm referring to myself? Did I say I can't afford a visa? Thailand's full of farangs who think there experts on anything & everything. When I'm in Thailand the last thing I'd be doing is being a keyboard warrior on FB. Better things to do than spend my time on here, when I'm there.
I wouldn't say it means a fixed amount. As long as you have an amount of money in your Thai bank account and monthly transfer that always comes to at least, or more than 800k THB.
I flew OmanAir from Manchester back in 2018. Very pleasant flight. Cabin crew very polite and professional, unfortunately for whatever reason they no longer fly from Manchester I believe.