In Bangkok you can go directly to the immigration office and get the 30 day extension for 1,900THB….this is contingent on when your plane arrives and you will make there during their normal work hours of M-F minus Holidays….
then definitely go the 6 month METV which you can get 9 months out if it with strategic Border bounces…make sure you get registered wherever you’re staying get the Pink ID Card and yellow house book this will help in opening a bank acct, drivers license etc
he said he wanted to manage a retirement visa…reading is fundamental…management of a visa is doing all the baseline ground work to make the visa a success…house, bank acct, etc all the ducks in a row so that when you apply you don’t have any hiccups
If you have a UK passport you will get the 30 day visa free waiver stamp which can be extended at your local immigration office for 30 days at a cost of ฿1,900…
you can also purchase a 60 day SETV visa for ฿1,900 in the UK then extend it for 30 days for ฿1,900 at your local immigration office…
you can also purchase the 6 month METV for ฿5,000 in the UK where I guess you have residency status or any county you have a passport for or legally recognized residency within. With strategic border bounces you can get 9 months out of the 6 month METV, but you can’t stay in country for more than 90 days at a time