What are the requirements for getting a lateral flow test in Thailand before flying home to London?

Nathan is seeking information on obtaining a lateral flow test in Thailand before traveling back to London. He wonders if these tests can be purchased at local stores like Boots or Watson’s, and whether he needs to keep the test results as part of the UK home locator form. Comments suggest that recent rules may require an RT-PCR test instead, or a lateral flow test with a proper certificate from a test center, rather than one bought from a pharmacy.