I feel a bit uncomfortable about people having to mark themselves out with a lanyard about a health issue, to the general public.
In Wales, they have said that people with exemptions do not have to wear one, but you need a letter from your GP to show to shop staff...and since you can't get GP appointments except for emergencies... Oh, you are also exempt if past abuse would make wearing one too traumatic...but again, you are required to explain your reason for non compliance to shop staff. Not sure why the government thinks it's a good idea for anyone who is too traumatised by abuse to wear a mask to be forced to tell total strangers about that abuse... Or why people will want to share their disabilities with supermarket staff either!