Debt Crisis: Greek Euro exit may cost UK £5bn Leaving the euro would prompt a run on Greek banks and the collapse of its finance sector, the report predicted. That would mean another international bail-out. Support would probably come from the European Union and the International Monetary Fund, the report said. Britain has said it will not participate in any new eurozone bail-out fund, but as an IMF member, it would still be exposed to the Greek rescue package. The UK's overall exposure to a post-euro bail-out - technically a loan which it would hope to get back - would be between €4 billion and €6 billion, Open Europe calculated. Although Greece remains the country most likely to be forced out of the euro, financial markets are also worried about Spain, where a weak banking sector threatens to push the government into full-blown crisis. EU leaders remain split over a plan to create a European "banking union," using existing funds to back troubled banks. Spain, France and the European Commission are in favour, but the plan has been rejected by Germany, which does not want German taxpayers to have to support banks in poorer, southern economies. Pierre Moscovici, France's finance minister, and Olli Rehn, the EU economics commissioner, called on Germany's Chancellor Angela Merkel yesterday to back "direct bank recapitalisation." George Soros, the currency speculator who made millions betting that Britain would leave the Exchange Rate Mechanism in 1992, has predicted that the crisis will come to a head in the next three months.