Originally Posted by
skywalkerLAX
You must be dreaming if you believe this to be accurate. You'll be denied boarding at LHR at the earliest or denied entry at the EU border the latest and then returned at the expense of the airline.
People must really think the authorities are stupid or something.
U.S. Citizens allowed in UK but they must provide address where they will quarantine for 14 days and likely download the UK government's track and trace app. Do you have personal knowledge of an American citizen arriving LHR and being denied entry?