Consistent with earlier advice in this thread, I am planning to seek a 1-year O-A retirement visa from my home Royal Thai Embassy in London. However, what does a verification/guarantee/reference letter from one's bank (in support of bank statements confirming a minimum balance equal to THB 800k) need to say in order to satisfy the Thai authorities? Sorry if this sounds a daft question, but I have not been able to track down any guidance on this point.

Also, has anyone had any experiences (good or bad) of obtaining an O-A retirement visa from the Royal Thai Embassy in London?