A colleague of mine had to travel to Italy 2 months back. On arrival, she had to quarantine in Rome, then once cleared had matters to settle in Milan and then at the family home in Ancona. She was contacted each day with some visits during the quarantine phase to ensure that she was symptom-free and complying.
Upon arrival back in London 4 weeks back she was advised to stay home for 2 weeks but has had zero contact since arriving at Heathrow. No requests for test certificates, nothing!
Its mind-boggling stuff.