By law they don't have to show you exemption certificates. I do not have to wear a mask under medical grounds, but I wear one when I go into shops, because I get fed up with all the dirty looks and comments saying that you can get anything off the internet these days. Was even stopped by an enforcement officer ( the ones who give out fines for littering) showed him not only my exemption certificate also the phone app, still did not believe me, he started to write out a fine, luckily before finishing I started to walk away that's when he grabbed me, that gave me grounds to use force on him, cut a long story short, police turned up, asked me if I wanted to take it further, I said no just leave it. E had a good talking to and was made to apologise to me.
By law, I don’t have to let them enter my business and, potentially put my other customers or staff at risk .
I think this is what will happen now, if they can’t wear either a face covering or a face shield, they can stay away.
It takes no more than a minute to come into my cafe and sit down, if they can’t abide by the rules for that small amount of time, I don’t think they should be out of their homes.