I’m doing the same. The only major difference is that when I apply for my first extension after my second year I will now have to show the previous 12 months of income over 65,000thb
As said above get the O-A visa in London. Police check online, doctor signature approx £25, documents notorized at the Post Office, £10.50 per document. No proof of funds needed in Thailand for 2 years so if you are going the lump sum route you dont have to change sterling to baht at the current poor rate. And your always dealing with English speakers, its definitely the way to go.
As explained above use your U.K. account for the original visa. You won’t have to show any money in Thailand for 2 years if you leave and re-enter just prior to the visa expiring. You don’t have to tie up 18k if you can show an income of
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thb or a combination of income and money in the bank totalling 800,000thb.