“The British government is making urgent preparations to cope with the fallout of a possible Greek exit from the single currency, after the governor of the Bank of England, Sir Mervyn King, warned that Europewas “tearing itself apart”.

Reports from Athens that massive sums of money were being spirited out of the country intensified concern in London about the impact of a splintering of the eurozone on a UK economy that is stuck in double-dip recession. One estimate put the cost to the eurozone of Greece making a disorderly exit from the currency at $1tn, 5% of output.

Officials in the United States are also nervously watching the growing crisis: Barack Obama on Wednesday described it as a “headwind” that could threaten the fragile American recovery.”

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