The wearing of face coverings in shops is now a legal requirement but you should not ask your GP for proof that you are exempt.
Shops and supermarkets will be expected to encourage compliance with the law and can refuse entry and Police have the powers to enforce this law.
Many people may feel uncomfortable at the thought of wearing a face mask but there are good reasons for doing so and people are urged to remember that this will help us to defeat the virus. Face coverings are required not to protect the wearer, but for those they come into close contact with, as many people can be Coronavirus positive but have no symptoms. You could feel fine but pass the virus to someone who may suffer severe health consequences or even die. There are a number of exemptions, but you should not ask your GP for proof you are exempt. This is not a good use of a doctor’s time or NHS resources in the current circumstances. It is up to individuals to demonstrate they have a valid exemption.
Information on face coverings when to wear one and how to make your own can be found by following the link.