Unless we shut down every sector except for food, medical care and distribution this lockdown (or even a much stricter one) simply will not work.
Mostly everyone outside of hospitality/gyms is working as normal - I don't disagree with this - as we need an economy to return to. Supermarkets are packed, because people need food. Public transport in cities are rammed because people need to get to and from said work. Some schools are full because the key worker list is so long. The infection rate will continue as before.
The real elephant in the room is that we will have to furlough almost everyone in every sector to beat this new variant, and the government is just not prepared to do it/or can not afford to.
The new variant seems to be beating the odds even in areas that have already had a very hard lockdown for a long time, with no sign of it abating or even levelling off slightly. I don't believe it is the 'rule breakers' that are causing this at all, as I don't think in reality there are that many of them - certainly not enough. The new variant is so infectious that almost any attempt to stop it is futile and pointless, that is the truth of the matter.
Even if they stop all exercise, introduce zero household mixing and close nurseries, we will still continue to see a high infection rate, because even brief contact seems to be infecting people.
I am quite neutral in terms of how I feel about this, because at least we have a solution that will set us free in the coming months, but instead of blaming 'people' for not following the rules, we need to have a much closer look at the new variant, and being more honest about the limitations of this lockdown in the face of such an infectious strain.