you're knocking your head against the wall on this one. Most "expats" want to believe that everything done here is some conspiracy to extract every last baht from them, or to make things so difficult for them, they leave the country with all their money. They're generally the same people who cry about immigrants and open borders in the western countries they left. Their lack of critical thinking and detachment from reality really is quite something
I gave you the first accurate answer, scolded the guy who said Google it and now I'm a keyboard warrior? Okay then. But you are still welcome for the advice
With UK passport you get visa exempt for 60 days in Thailand (although rumours keep swirling that it may return to 30) 45 days visa exempt in Vietnam and 90 days visa exempt to Singapore. Just make sure you have proof of onward travel in each case .