David Broadfoot my understanding was Australia and Thailand had the licence treaty. I'm sure I've seen it somewhere, but am struggling to find it. Things may have changed? I do know you can drive in Australia with a Thai licence as long as you are not a permanent resident of Australia. Once you become a PR, you are required to get an Australian licence.
David Broadfoot interesting to hear. I regularly hire cars from the airport using my AU licence and was told it's OK. I'll look into it some more. Thanks! I found this. Not sure how accurate it is?