Police refused to enforce the Law on face coverings so public indoor spaces became virus hotspots. Hopefully that is changing now.
Government thought foreign travel was more important than public health. Hopefully that is changing now (but borders are still open, a lot of people misunderstood what travel corridors meant and the fact that closing them just means people have to quarantine). This quarantine may not be policed either.
Police focus on the relatively safe activities of driving for exercise.
Poor quality PPE provided to NHS staff treating Covid-19 patients (non-ICU staff only getting an FFP1 paper mask and plastic pinny, when in reality a non-ICU Covid-19 patient is highly infectious and producing massive viral loads).
So many non-essential workplaces open and no policing of this.
Christmas mixing of households permitted by the government - the current deaths right now involve people who caught Covid-19 at Christmas.
The vaccine roll-out is going amazingly, but divide the numbers by a million. if you had to vaccinate 66 people and you had done 4, it would be clear there was a long way to go (even if you weren't going to vaccinate anyone under the age of 16, that is still a lot of people to get through). Half of patients in critical care are under 50 and not ECV apparently.
Giving into a small number of idiot backbenchers and Tory party donors rather than giving into the scientific advice until the very last minute. Consistently lifting lockdown too early and prioritising pubs and other hospitality industries. Lockdown 1 worked, the benefits of low virus levels were wasted on hospitality and foreign travel.