What would work better is if customers (my husband works in a supermarket) actually adhered to social distancing (2m folks, 2m!), didnt stick their faces in his when wanting to ask questions , members of staff didn't turn up ill, if management actual figured out how to manage and actually put into practice all the safety precautions that they say they will (1 in 1 out only works if you dont let 2/300 people in at once initially.... that would help more than face masks I'm sure of it.
Ok and rant over, but, hasn't it been disproved that wearing non safety compliant masks actually hold the virus closer to face causing greater risks (happy to be corrected with reputable source if this is incorrect).