My passport expires in 2028. I am ninety-one. The last time I renewed my passport, I was in NZ. My daughter inquired at the British Embassy in Auckland, who gave her sound advice. She sent my passport off to the UK. Received notification from HMPO that they had received it and that everything was in order. I received my new passport and old one clipped within three weeks. Excellent service. Doing it from Thailand sounds like a nightmare. I'm not looking forward to it. That's if I'm still around. 😦