Also from a business point of view, I personally would not use a hairdresser, small shop, etc, where face coverings aren't worn. Transmission rates are very low in my area, but there have been some mini-surges and, having come this far, I don't want to risk it. I realise that I can't avoid all risk, but I will still avoid when I can.
Businesses are going to have to weigh up the risks for themselves - whether to try to increase business by allowing everybody in or to advertise that they're still Covid-safe to encourage customers like me. They have to consider the safety of their own staff too.
GrannyGravy A multiple-layer mask worn over the mouth and nose is not going to be next to useless. As many articles have pointed out, it's not the same as going into an enclosed space filled with poison gas or barrier nursing an infectious patient. It's about reducing the volume of virus-laden particles floating about at face height.