Yes the retirement might need cancelling. For me to move from O Retirement to a B the O had to be cancelled first. Then Embassy woukd not accept the B application with my O still being valid. No idea if different for DTV. If you leave on O without re-entry permit though it is cancelled.
Exactly. One of the most cringiest things possible is watching foreigners Wai at the wrong time and place. If you do not know how to do it correctly then do not do it was advice I have always been given. If you are meeting someone senior you will be given advice.
How does the bank know if I get a new passport? Absolute nonsense. Yes I need to update passport details at my banks but there is absolutely no way they would know if I did not tell them. Who woud tell them? The UK HMPO or Thai Immigration? The only 2 possible?
Anonymous participant 650 Certificate of Residence is the correct term. Often needed for a bank account. Needed for driving license and buying a vehicle among other things.