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DocTap at Heathrow (site is at a nearby hotel) is a potential option, no matter how tight it is. They can provide a PCR test result within 3 hours, and is recommended by Cathay
https://doctap.co.uk/covid-19-test/
It's not inside the terminal. In fact, inside the hotel Radisson Blu Edwardian Heathrow 140 Bath Road, Harlington, UB3 5AW