People keep going on about personal responsibility for 'sticking to the rules' as if this is the only thing that would make lockdown work, but there is an economic dimension to it, too. Unless people are assured of financial support when they isolate, those living on the breadline (or below) just aren't going to do it. There are still 3 million people who have never had any financial support from the government. They can't live on fresh air.
Additionally, government has failed to establish the importance of ventilation in the minds of the public, carrying on with its inane 'hands, space, face' message (and forcing children into poorly ventilated schools) long after the danger of aerosols was well established. I could continue, but I'm sure you get my drift.
It's no wonder that people aren't observing 'the rules' as rigorously as they did when the government is failing to do what it could do, in fact making the situation worse (schools) in some cases, and failing to support people to enable them to 'do the right thing'. Draconian measures won't help. Government has to play its part; which it isn't at the moment.