Wales is facing a leek shortage as the nation prepares to celebrate St David’s Day on 1 March. The vegetable is one of the national symbols of Wales and is traditionally worn as a badge and eaten in such dishes as cawl and leek and potato soup to mark the patron saint’s feast day. But farmers have warned that the UK’s supply of leeks has almost run out, in part due to a 15 per cent surge in demand as more people cook from home during the...