There was a nil cost option here.
£1000 fine for anyone not following social distancing rules or wearing masks. Double it each time it happens again. Obviously a tiny minority have a reason not to wear a mask and that can be sorted, but make it a strict liability offense for everyone else.
We already have facial recognition tech on building sites to pick up those not wearing appropriate PPE. Can't be a biggie to have this stuff automated in supermarkets etc. Shout big brother, I dont care: this is a situation that needs it and it means it can be deployed at scale.
All of that cash goes into an NHS staff fund, distributed each month to NHS and private medical staff putting their lives at risk because cretins refuse to wear a mask. and it can be tax free as the morons without masks have already paid the tax on it.