Guidance from Gov.uk
There are some circumstances when wearing a face covering may be marginally beneficial as a precautionary measure. The evidence suggests that wearing a face-covering does not protect you, but it may protect others if you are infected but have not developed symptoms.
A face covering can be very simple and may be worn in enclosed spaces where social distancing isn’t possible. It just needs to cover your mouth and nose. It is not the same as a face mask, such as the surgical masks or respirators used by health and care workers. Similarly, face coverings are not the same as the PPE used to manage risks like dust and spray in an industrial context. Supplies of PPE, including face masks, must continue to be reserved for those who need them to protect against risks in their workplace, such as health and care workers, and those in industrial settings like those exposed to dust hazards.
It is important to know that the evidence of the benefit of using a face covering to protect others is weak and the effect is likely to be small, therefore face coverings are not a replacement for the other ways of managing risk, including minimising time spent in contact, using fixed teams and partnering for close-up work, and increasing hand and surface washing. These other measures remain the best ways of managing risk in the workplace and government would therefore not expect to see employers relying on face coverings as risk management for the purpose of their health and safety assessments.
Wearing a face covering is optional and is not required by law, including in the workplace. If you choose to wear one, it is important to use face coverings properly and wash your hands before putting them on and taking them off.
Employers should support their workers in using face coverings safely if they choose to wear one. This means telling workers:
You can make face-coverings at home and can find guidance on how to do this and use them safely on GOV.UK.