Supermarkets appeal for calm as shelves empty

Major chains vow to step up deliveries and tell customers there is no need for panic buying• Coronavirus – latest updates
• See all our coronavirus coverageBritain’s leading supermarkets are pleading with customers to refrain from panic buying during the coronavirus crisis, with some already rationing items and turning new customers away to cope with demand.In a highly unusual move, all the major operators including Tesco, Sainsbury’s, Asda and Ocado signed up to a le