Hong Kong
Will be added to this list of countries and territories with approved proof of vaccination 4am Monday 11 October. If you arrive in England before that date you must follow the rules for people who are not fully vaccinated. If you arrive after that, you can use a vaccine certificate to prove your vaccination status.
https://www.gov.uk/guidance/countries-with-approved-covid-19-vaccination-programmes-and-proof-of-vaccination