Doctors are advising people to go to http://keepsafe.org.uk. where you can download a legal mask exemption card that is both lawful and legal to use providing you meet the given criteria.
For those who don’t want to wear a mask but think they must, this 6 minute video explains your citizen's rights and the law concerning mask wearing:
More information at https://www.carolinestephens.net/blog
The random thoughts of 99th Monkey . . . an occasional rant and other reflections in the hall of mirrors.