I live in Udon Thani and have a Non Imm B visa which my school extends for me each year. It expires on Friday 11th October. This year i have decided to return to Australia for 2 years to qualify for my pension but I will be back and so want to do everything by the book. Supposing I book a flight from Bangkok on 11th, finish work on 4th October and hand my work permit to the school on that day? In the intervening 7 days , do I need to inform immigration (say ,on the Monday ) and do I need to cancel my extension) and if it needs to be cancelled , can it be done in advance so that I can fly on 11th? I would be grateful for any advice,