Chong Chom is a friendly border point, but known they keep asking people for the proof of accomodation for the first few days in Thailand and 20,000 THB or equivalent in cash, and an onward ticket. At least three of my aquaintances happened to be asked at the Chong Chom border when doing a 30 day visa exempt entry. For
as long as flights are leaving Bangkok to the UK, there is no "emergency situation" and your embassy won't issue the letter that certifeis that you have been stuck in an "emergency". That means if there is no cause, there can't be any leniency. You can still go for a second border run for a visa exempt entry
why do people write so much rubbish if they don't know? No medical certificate is needed for a UK citizen for entering Thailand. They might check if you have any fever and maybe you will have to fill out the TM8 form, declare yourself willing to self monitor yourself for the first 15 days. You CAN definitely fly if your flight is going, even against the advice of your government. Holing yourself up in Thailand is probably safer than doing the same in the UK as Thailand is handling the measures greatly for the last 8 weeks, yet. Regarding your travel or longstay health insurance: i doubt they pay IF you catch specifically a Covid-19 infection, but you doubtless are insured for everything else, your governemnt has "adviced" but not "forbidden" travel! If in doubt, call them or email them
you MIGHT get asked for the three proofs, so it is advisable to get them. As for the O/A . .you are in the second year, so just exit Thailand without a re-entry permit, as this will invalidate the O/A and you will be able to enter by 30-days visa-exempt
. . wrong. Only these 6 countries need a medical certificate: THAILAND - published 13.03.2020
1. Passengers arriving from China (People's Rep.), Hong Kong (SAR China), Iran, Italy, Korea (Rep.) or Macao (SAR China) must have a Health Certificate as well as Lab Test COVID-19 to prove they are free from Coronavirus (COVID-19). The Health Certificate and Lab Test COVID-19 must be valid for not more than 2 days prior to departure
you cannot "extend the visa". You could only receive the "extension of permit of stay" if you meet the requirements for a 1-year extension as described by Robert and Tod, above. If you don't meet the requirements, the only way of staying in Thailand for yet another while, is by getting a tourist visa on any embassy or consulate in a neighbouring country, or by doing a border run which will get you a 30-day visa exempt entry
"7. Nationals of Bulgaria, Bhutan, China (People's Rep.), Cyprus, Ethiopia, Fiji, Georgia, India, Kazakhstan, Malta, Mexico, Nauru, Papua New Guinea, Romania, Saudi Arabia, Uzbekistan, Vanuatu and passengers with a Chinese Taipei (on the cover: Republic of China Taiwan) passport can no longer obtain a visa on arrival" . . (source: IATA)