the visa exempt entry of 60 days plus 30 day extension gets you 4 MONTHS... and with a single border bounce will get you the New 60 day visa exempt entry stamp. That's 6 me months with added 30 days extension possible.
With the current Thai banking situation, if you did not keep your Thai Bank account open, then you will have to find other ways to Access funds from your UK account in Thailand. As those who are on visa exempt entry and tourist visas are now not able to open or keep open a Thai bank account.
You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.
Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.