Iceberg lettuces are pictured for sale in a supermarket in central London on February 3, 2017. British supermarket giants Tesco and Morrisons said they were rationing vegetable sales on Friday as shoppers tweeted their frustration over widespread shortages caused by bad weather in southern Europe. Courgettes, broccoli, aubergines and salads were either unavailable or in very short supply in a selection of supermarkets in central London. / AFP PHOTO / Daniel LEAL-OLIVAS