I have dual nationality and hold 2 passports - UK & Australia. I am currently in Thailand on the UK passport but have a valid Thai non-Imm visa in my Aust' passport which I now want to use. I tried to enter Thailand from Malaysia last week, switching to the Aust' passport but Thai immigration needs to stamp next to the Malaysia exit stamp, which is in the UK passport. In other words when entering the country they won't allow me to switch passports. What's the easiest way for me to use the Australia passport without returning to Australia and starting from scratch?