//Probably think you have gone out and a fine comes through the post?//
I don’t think so. They have to prove that I’m out. Not getting an answer from my front door and them “thinking” I am out does not do so.
//Are you hiding at that point or do you shout through the door,'I'm here but not opening up'?//
I’m doing neither. I’m indoors reading a book with all the curtains closed.
//How do you know the person you’re answering the door to doesn’t have COVID?//
I don’t. That’s one of the reasons I’m reluctant to answer the door. :-)
The serious point is that this nonsense is unenforceable. Unless they actually intercept me whilst I’m out, enforcement is impossible. If they suspect I’m out when they call they will have to wait outside my house until I return (and even then I may sneak in the back door if I spy them at the front). In my scenario above they’ll wait a very long time. If I really was out, perhaps for the day they would equally be in for a wait. This legislation relies on compliance and I’m not so sure that people coming back from their hols will comply with these draconian measures. The legislation is far more harsh than the March lockdown. It is truly “house arrest.” You cannot leave for exercise; in fact you cannot go out at all except for a very few specific purposes such as to get medical treatment, to partake in legal proceedings and to go shopping “…to obtain basic necessities such as food and medical supplies for those in the same household (including any pets or animals in the household) where it is not possible to obtain these provisions in any other manner.”
It is truly a breathtakingly Draconian piece of legislation, the likes of which I have never seen and hope never to see again. But most of all, apart from being unenforceable unless by pure luck, it is also an extremely blunt instrument. Many of the places from which people will arrive and are expected to isolate have far lower rates of infection than the places they are isolating in. It is a preposterous attempt to be seen to be “doing something”: “Quarantine is ‘something’, so let’s do that.”
I would never normally encourage law breaking but when the law is “a ass” and it is drafted principally by asses it is disreputable and is worthy of the contempt which dd proposes to demonstrate.