Just to clarify.
I opened an account with Kasikorn last Friday. Needed a Certificate of Residence. No problem, Jomtien very efficient collected it after 1 hour (I had expected it to be next day - or posted).
I had wanted to open an account in my name and also a joint account with the missus. Unfortunately, I couldn't get hold of her on Friday so we went together on Monday. Perhaps I shouldn't have been surprised that Kasikorn require ANOTHER Certificate of Residence and cannot use the one they had from Friday.
I thought I would be clever and call the Call Centre in the hope that they might say different. No, they confirmed that there is a strict set of documents that are needed for each account opening.