This was posted on Twitter yesterday by Keith Burge @carryonkeith
A German national of my acquaintance has just flown into the UK, clutching details of where he intended to subject himself to a 14 day quarantine. He asked with whom he should lodge those details. Nobody knew. He walked through and out of the airport unchallenged.
This govt never wanted to implement this and any failings can be off loaded onto those who have to implement this system, usually, without much information (as in Leicester this week).