The public should carry a face covering when they leave home the head of the Royal Society has said.
Prof Sir Venki Ramakrishnan, president of the Royal Society, said the coverings should then be worn “whenever you are in crowded public spaces”.
Prof Ramakrishnan said the public remained “sceptical” about their benefits because “the message has not been clear enough” and guidelines have been inconsistent.
He added: “What we would like for the government is to be a bit stronger and clearer about the messaging and require it whenever you are in crowded public spaces where you cannot get more than two metres away from the next person.
“If you’re in a crowded setting, you ought to wear a mask.”