Government advice on the use of face coverings can be found here. This link includes a list of reasons why someone might be exempt from wearing a face covering.
Following national discussion, we recognise that the government guidance on exemptions suggests there is no requirement for evidence for exemption. Therefore it is sufficient for an individual to self-declare this.
The responsibility for issuing exemptions lies with the transport provider, not the patient’s GP. Similarly, practices are under no obligation to provide letters of support for anyone who does not fall under the list of exemptions but considers them to have another reason to be exempted.
Patients needing to travel on public transport in London may wish to print-out a self-exemption card which has been approved by TFL. This can be displayed on clothing or a lanyard. It can be found here.
See also another Government exemption template: