I am in U K and due to fly direct ,in Bangkok 4 November.I had problems getting the Thai medical cover and the company haven't sent the Thai certificate signed by a company director.my cover is £1.375 ,000 GBP.is it possible to arrive Thailand ,entry stamp and apply for initial 1 year retiree oa at Udon Thani .Can entry stamp period be extended so I can get Embassy affidavit for marriage to my Thai partner ?