Nice, exactly this! I've only started feeling confident enough myself in the past fortnight to no longer hang a sign around me as the Nazi's had the Jews doing. On the odd occasion I have forgotten it I've only been asked once where my mask was which led to a confrontation with 3 staff members. I largely put me not being questioned down to the fact most of the time I'm with my 2 young children, however I can honestly say my partner is aggressively questioned weekly. I've posted some of these encounters in the past. He has honestly been told on at least 3 occasions 'we don't care if you're medically exempt, you're not being served' I've made complaints on his behalf when this happened in Tesco, TfL and Starbucks just this week. TfL have been the worst offenders, he's had bus drivers refuse to stop motioning his lack of mask before even asking his reason, he's had 2 bus drivers call the police on him and had an aggressive confrontation with police inside a station. Thank God the magical words of 'I'm exempt' have kept the police off his back, where we've seen others hesitate for a split second and literally the police pounce and use violence against them echoing sights we saw in China last year. I'm getting sick and tired of these false martyrs exercising their own rules and blatantly breaking the law themselves, police included and the saddest part is many of the public think it's justified.