The TK website refers pax to the IATA website https://www.iatatravelcentre.com/pas...quirements.htm to check document requirements. Once there you will see the health requirements for entry (alongside the usual visa details), in this case: negative test, Passenger Locator Form (which must include quarantine hotel booking). Arrival without a booking risks a £ 4000 fine. There is a high likelihood that TK will check documents. Even if they won't border control will.