I had a layover in the UK recently on a trip from the U.S. to the EU, where I had to exit the international transfer zone to check in for the next flight. I did not complete a passenger locator form.
In principle, a "passenger locator form" is required for all entries to the UK due to COVID. However, my entry was for about one hour, and I did not leave the airport.
I am wondering, did I really violate anything, and could there be any consequences the next time I enter the UK?