Can I apply for a COE with a return flight 75 days after arrival if I have a visa exemption from the UK?

The question concerns whether one can apply for a Certificate of Entry (COE) with a return flight date 75 days after arrival in Thailand, given a visa exemption from the UK and a plan to extend the stay by 30 days. Comments reveal varying opinions: some assert that it is necessary to have a flight back within 45 days to avoid boarding denial, while others mention that prior to Covid, they had successfully used a 60-day return ticket without issue. There's uncertainty regarding regulations at embassies and how knowledge of extension policies may differ among them.