European Union officials have called for the UK to start the exit process as quickly as possible after Britons voted to leave the 28-member bloc, prompting the resignation of David Cameron, the prime minister, and dealing the biggest blow to European efforts at greater unity since the second world war.
The outcome of Thursday's EU referendum - a 52-to-48 split in favour of Britain's exit - caused financial markets to fall sharply and brought the British pound down to a 31-year low, its biggest drop in history.
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