I'm after some advice about transiting through Bangkok Airport from Cambodia to UK on the 30th April. We have to wait 21 hours at the airport in Bangkok until our flight, so we need to collect our luggage and check in again. I read that we have to get medical insurance for $20'000, is this still the case? And would we need to do a PCR covid test? I've found only conflicting answers and outdated advice so far so I'm hoping to get a definitive answer.