Sainsburys, John Lewis and Waitrose will continue to ask customers in England to wear masks in their shops even though Plan B rules have now ended. Rail operators also said passengers would still be expected to wear masks. Those keeping the policy in place said they would encourage, not force, customers to comply. Plan B rules have been lifted because infections have peaked nationally. But the government is still advising people to wear masks in enclosed or crowded spaces and when meeting strangers. Retailers continue to implement many other existing safety measures such as hand sanitiser and perspex screens. The main purpose of wearing masks is to protect others, though there is some evidence they offer protection to wearers.