GOV.UK - For ENGLANDTYPE of Test
https://www.gov.uk/guidance/coronavirus-covid-19-testing-for-people-travelling-to-englandYou must make sure that the test provider you choose can meet the standards for pre-departure testing.
The test must meet performance standards of ≥97% specificity, ≥80% sensitivity at viral loads above 100,000 copies/ml.
This could include tests such as:a nucleic acid test, including a polymerase chain reaction (PCR) test or derivative technologies, including loop-mediated isothermal amplification (LAMP) tests
an antigen test, such as a test from a lateral flow deviceIt’s your responsibility to ensure the test meets the minimum standards for sensitivity, specificity and viral load details. You must check with your test provider that it meets those standards.
You may not be able to travel if the test does not meet these standards. It’s your responsibility to ensure you get the right test that meets the above requirements.