We know that many Greeks are simply taking savings out of their banks in cash because they fear for the future. Many are now speculating that this 'capital flight' could force the issue of Greek membership of the eurozone before the country returns to the polls on 17 June.

Since 2009 some 16 bn euros, or almost £13bn, have been moved abroad, and that trend is accelerating. Last Monday alone Greeks withdrew 700m euros from their banks.

The BBC's Europe business correspondent Nigel Cassidy reports from Greece that the latest surge of capital flight is being "led by families".

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