Princes, which sells canned tuna, has warned European supermarkets it will raise prices - Chris Bull/Alamy Stock Photo One of Britain’s biggest food suppliers is pushing through emergency price increases as the war in Iran sends shipping and ingredient costs soaring. Princes, which sells canned tuna, Super Noodles and Branston beans, has warned European supermarkets it will raise prices from Wednesday after the Middle East conflict unleashed “unprecedented cost pressures”. In a letter to supermarkets o ...