Can you travel back to the UK while on a retirement visa in Thailand and still meet the 90-day registration requirement?

A retirement visa in Thailand requires you to maintain 800,000 baht in the bank (or 400,000 baht if married to a Thai national) and you must register with immigration every 90 days. The 90-day reporting is necessary only if you have been in Thailand for 90 days since your last entry. You can travel back to the UK anytime within those 90 days, but make sure to obtain a re-entry permit to maintain your visa status upon your return.