Couldn't find a thread about this which surprised me.
As far as I can make out customers at hairdressers should wear face mask but the stylists only wear a visor (which doesn't offer any protection other than preventing droplets landing on their face). I have read a couple of studies reporting transmission of virus to visor wearers where those wearing face masks were protected.
Why (other than another incompetent, nonsensical rule from govt) are visors but no face mask recommended for stylists (who are literally breathing down the neck of customers for >15 minutes)?