@Wayne *******
please keep in mind, as soon as the "second year" out of the Non-O/A visa is nearing expiry, you must apply for the one year extension of stay, for this the financial proof needs to be made on Immigration inside Thailand. This means on the day you apply, you (UK citizen) either need a minimum of 800,000 THB in your Thai bank account, seasoned for 2 months, or do the proof with a 12-months bank statement, showing you transferred every month, month for month, a minimum of 65,000 THB into your Thai bank account in the recent 12 months, along with the proof it came from abroad. . . . . And regarding the mandatory health insurance, from the 1-yesr extensions onward, Immigration will only accept a tgia-listed Thai private health insurance