The government has published this guidance for private providers of ‘Test to Release for international travel’. By law, all tests used for the purpose of shortening the self-isolation period for international arrivals must meet certain minimum standards.
Providers must also complete a declaration that their tests meet these standards.
The minimum standards can be seen here: Minimum standards for private-sector providers of COVID-19 testing for ‘Test to Release for international travel’ – GOV.UK (www.gov.uk)