Just been to the shops, most people wearing masks but a significant portion not (interestingly it was mainly overweight middle aged men, only mentioned as they have one of the worst outcomes so it seemed strange)
I can see only a tiny % of over 12's not being able to wear a visor that sits on your head with clear plastic in front of the face. I understand why people can't wear masks but the fact no one is allowed to challenge anyone means the selfish hits that have no medical reason get away with not wearing them.
By insisting a visor or mask before entry to a shop I would imagine the anti mask brigade would start wearing masks which is more effective in preventing the spread as a visor would be more faff.
IABU: you can't make people wear PPE
IANBU: make masks OR visors compulsory