Appreciate some clarification please. I’m in Thailand on an O-A visa which expires in January 2021. I got it at the embassy in London so only had to have the annual health insurance, not money deposited in a Thai bank. I believe I can extend for a year without depositing money if I leave Thailand and return before the expiry of the visa. Putting aside current restrictions on leaving and returning, is that correct? And if so, I assume there’s no restriction on where I go - I could just hop into a neighbouring country and back? Thanks in advance. 

Correct.

Re Enter before expiry date of visa to get 12 months.

If you cannot leave and enter before you visa expires you will have to do an extension which will require both money in the bank or proof of monthly income plus the required insurance for those on OA visas

Thank you both.