I never received anything like that, but thanks. So it looks like all I need apart from the other required forms is an update in my bank book, not the letter as required when applying.
by the way, I am not talking about a bank statement. I am asking about the letter from the bank that shows that you have 400,000 baht remaining in the account
so I can't know what other doc's I may need without going there to ask them before I am required to go and get the final stamp? Probably better I just go to the bank, get another letter anyway. Saves going twice.