the expiry of a visa validity and the expiry of a stay permit stamp are TWO completely different dates! If you buy a re-entry permit, it will expire on the same date as your stay permit. It will NOT expire on the date the visa validity expires
you also could apply for a 365-days Non-Imm-O/A visa in the U.K. This will stamp you in on each entry for another 365 days (given that the mandatory health insurance which is needed for this visa also carries that far). You use it for 5 months and two weeks, go back to the U.K., re-enter before the expiry of this visa and make a border run, this will get you stamped in for the last 365-days. This visa would cover two 6-months stays, within a two-year period 😉 . . the financial proof of 800,000 THB equivalent in GBP can remain in your UK bank account
I am referring to the application to the initial 90-days Non-Imm-O visa inside Thailand only. If you apply it in your home country, there is no need to prove where the 800,000 THB came from
it's a part of the standing police order of the change of visa type" that the 800,000 THB must have been transferred from abroad for the application to the initial visa. Jomtien Immigration makes an exception, however Jomtien will ask for a 2 (or a 3!) months seasoning for the application to the initial visa
and if you use WISE, and need the transfer to be coded as having come from abroad, you need to pick the correct reason for the transfer when asked by WISE. Because WISE normally uses their Thai account for the last step, so it will be coded by your Thai bank as having come from inside Thailand
For the 90-days Non-O visa application in your home country, it can be on any bank account anywhere, as long as it is in your name
For the application to the 1-year Extension of Stay, it must be on a Thai bank account in your sole name
If you do the “change of visa type” inside Thailand from a touristic entry to a 90-days Non-O visa, the money must sit in a Thai bank account in your sole name