These can be printed or kept on your mobile phone as photos;
https://www.civicmc.nhs.uk/files/2020/06/Face-Covering-Exemption-Cards.pdf
Thank you, Butterfly for this information.
S has a sunflower lanyard and card, he wears a mask most of the time, but if has the option to use the lanyard if he is becoming stressed or anxious https://hiddendisabilitiesstore.com
Melly1
These can be printed or kept on your mobile phone as photos;
https://www.civicmc.nhs.uk/files/2020/06/Face-Covering-Exemption-Cards.pdf
I think I just saw one recently
An officer handled it over to a tourist