That’s not really 100% how a Non-Imm-O/A visa works
The visa has a validity of ONE YEAR from the date it is issued.
The visa comes with a multi re-entry permit included, which is valid for the duration of the visa validity
*** when you enter, you will get stamped in for 365 days
Now, given you waited 4 weeks after the visa got issued, before you flew to Thailand, the remaining visa validity will be 11 months from the day you entered, and the remaining validity of the multi re-entry permit will also be only 11 months.
*** if you fail to exit and re-enter before the visa validity expires, you can only stay until the date that you got stamped upon the entry
You only get stamped into the “second year stay permit” of a Non-O/A visa, if you exit and re-enter before the visa expires, but you won’t have a re-entry permit any more after the expiry of the visa validity
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