pre departure test is ATK not PCR for U.K.. From Feb 1st, no test necessary. I’m not 100% sure what Thai airways requirements are… It’s not always just about your destination country, you also need to investigate your airlines rules, which by the sound of it, you gather. Message Thai airways on Fb and put the question to them.
the elite visa is a good option if you’re wanting to live in Thailand long term, without investing in business (and under 50). For anyone over 50 and wanting to stay long term, it’s pointless in my opinion. Look into a retirement visa and use a reputable agent to help you arrange your first visa. After that, it’s easy enough do the renewal yourself.
Phuket isn’t pronounced “foo ket”. Isan is the north east. Chiang Mai is cooler during the winter months (Nov-Jan) and the burning season isn’t so bad. Thailand is safer than most western countries. Thais are nutty. It is an amazing country!