I'm posting this for someone else. He's fairly sure he's screwed up, but I said I would ask if there is an obvious fix. Brit working in Thailand with a Smart T visa + extension. His UK passport needed to be renewed, and there are still long waits for overseas renewals. He did an urgent renewal online, sent his passport back to the UK with a relative, and they were able to pick his new passport up for him and bring it back to Thailand.
Now he has his old, cancelled passport (corner cut off), which has his visa, extension and stamps in, and a brand new completely empty passport. He started getting the paperwork together to transfer stuff over, but he needs a transfer letter that he should have got from the British Embassy (I think? I'm not exactly sure who the letter was from). If he had renewed it properly, he would have got the letter automatically, but because of his shenanigans, he hasn't got one.
Is this transfer letter essential? Will the British Embassy issue one given that he shouldn't have renewed like this in the first place? What options does he have to fix this?
Thanks!