When this pandemic began, M&S used to have an NHS staff only hour on Friday mornings (8-9am) and my wife got into the habit of grocery shopping there at that time on her way to work. For the first time in nearly two years, I went in there with her this morning and was interested to see how many shoppers wore masks and how many didn't. There were quite a few in the clothing area going towards the grocery area without masks but as if by magic, once they saw someone in a nurses uniform - my missis, masks appeared on faces! She said if she goes not in uniform, this doesn't happen but when she is in uniform, it's like a message goes out to say, 'you don't want to be on the wrong side of the medical profession here'!
Maybe, like the effect a cardboard policeman has on the rate of shoplifting when placed in store entrances, a cardboard nurse - mask on, suitable message visible - should be placed in areas with low mask compliance?