@Adam *****
you need to obtain a Certificate of Entry from the Thai embassy in London. Best way to contact them is through Facebook messenger. You need Covid health insurance that covers up to 100K USD. A fit to fly certificate and a Covid free test result no more than 72 hours before you travel. You need to arrange a flight and quarantine hotel in Bangkok (ASQ hotel). Theres around 10 airlines that fly daily to Bangkok these days.