Yes Chewbacca asking people to report on neighbours is to me the worst thing that the government has asked us to do. It smacks of 1984 and Big Brother when children spied on parents. I am lucky with my neighbours but as Candy6 has pointed out we don't always know the background of why someone may decide to stretch the rules. As long as we keep safe ourselves there should be no real need to report others unless of course there are extreme circumstances.
I am one who usually follows rules but as I am at risk have used my own knowledge about how a virus spreads to inform my responses regardless of what the government allows. Before and during lockdown, during the easing of restrictions and now in another tightening of the rules I have met up with DC and DGC regularly, outside either in local fields, on walks or in my garden always no nearer than 2 metres. Yes I am lucky that they do live near. On one occasion all 3 families ended up by fluke to play at the local play area and I joined them - 2 metre distance of course. I knew that none of them were likely to be infected whereas I would not be sure of that had any group of us met in a pub or restaurant among others, even outdoors. I can't understand why this time outdoors has suddenly become less safe. Nor do I get the word 'mingling' How do you do that at 2 metres apart?
I have visited a supermarket only twice, taking all the proper precautions. Twice I have attended a socially distanced barbecue in my DS's garden (only one family and 5 of us). On rare visits to the local shop I wear a mask, don't touch anything other than my purchase and pay contactless.
No family and only two necessary workmen have entered my house since last March. I kept the distance and sprayed everything they touched when they left. The closest contact I have had otherwise was a very overdue optician appointment and my flu Jab.
On the other hand last week I was urgently required for childcare in an emergency and went to another DC's house for a few hours. Under current rules, living alone, I could have called it a bubble (though I have never seen the sense in that) or as necessary childcare. I would have done it regardless of rules as it was absolutely necessary and family matters most. I had a bath and washed my clothes when I got home.
I think most of us on here are capable of using our common sense.