I am back in the UK having obtained a new UK passport. In my old passport I have a Thai retirement O visa and multiple entry permit which are valid until December. I understand these can be transferred but wonder about how this would work I read it has to be done in the office where they were obtained (khon kaen) So would I have any problems with the airline when checking in at the airport back to Thailand and what would happen at Thai immigration Suvarnabhumi , would they stamp me in the for the remaining days.
