But that's kind of the point - they're assuming correlation is causation.
Person a) I went to work (delivery driver), the supermarket, click and collect from . Most likely sources of contagion probably in the order they're written.
Person B) I went to the hospital, the supermarket, click and collect from , chinese take out. Same re order
Person C) visited my mum (in a bubble, but mum breaks the rules, or maybe she's working in a risky environment), the chemist, got a greggs.
Stats for contact points
shops (essential) - 3
workplace - 1
hospital - 1
family - 1
click and collect - 2
takeout food - 2
(obviously the collection tick boxes won't match these) but the point is that this data tells you where people have been, not where they've caught it. Each of these people is most likely to have caught it in somewhere which will remain open. But action is being taken to curtail the other places, which may well be utterly meaningless. Are we getting to that point? It seems perfectly possible.