GOV.UK: “Check the COVID-19 testing and quarantine rules for countries and territories on the red list for international travel to England.”

• Before you travel to England – red list rules
• When you arrive in England – red list rules
• Travelling with children – red list rules
• Red list of countries and territories
• Transiting through a red list country on your way to England
• Medical, compassionate and work-related exemptions
• Stay up to date