Britain's banks have been told to prepare for the end of the Eurozone, it emerged today. City regulator the Financial Services Authority has told banks to ready themselves for armageddon by running "stress tests" on their balance sheets. FSA chief Hector Sants met the heads of Barclays, Satander, HSBC, Lloyds and RBS last week. News of the shock warning came as the world's biggest central banks today launched a desperate bid to save the global economy by flooding markets with cheaper cash.