If people can't be bothered to observe social distancing then they are hardly likely to self-isolate for 14 days. I don't use my local shop as people are just going in and out as normal, sometimes in groups with pushchairs, no face coverings, no distancing whatsoever. (It's also a Post Office.) Some neighbours are already having several visitors.
On the pavement people walk close by even if I go onto the kerb, it's as though lockdown has ended already.
rayard.