After building quietly for months, the next stage of the global financial crisis is upon us, with the economies of Eastern Europe the latest to be hit. Hungary's stock market fell by 7 per cent yesterday and its Czech equivalent by nearly 4 per cent - while Poland, earlier down by almost six 6 per cent, rallied only once Warsaw had sold some of its euros on foreign exchange markets to prop up the zloty.

The trigger for this chaos was comments on Tuesday from Moody's and Standard & Poor's, the ratings agencies, articulating the concerns many observers have had in recent months. Having enjoyed a boom in the past decade, demand for the region's exports has collapsed and investment with it, while job losses are rising - one reason why not all the Poles have yet left Britain for home.

All this means that doubts over whether the governments and companies of Central and Eastern Europe will be able to service their debts are very much to the fore. Much of the borrowing in these countries during the bubble was not done in their own currencies but in others, such as the euro and the Swiss franc, which means that there will almost certainly be defaults.

The zloty, for example, has lost a third of its value against the euro since last summer, with Hungary's forint down 23 per cent and the Czech crown down by about 17 per cent in the same period.

The impact of these debt defaults will be felt fiercely in some Western European economies, particularly Austria, whose banks have lent the equivalent of a quarter of the country's GDP to the region. Sweden's banks are also heavily exposed. Consultancy Capital Economics calculates that Swedish banks have lent $90 billion (£63 billion) - nearly one fifth of Sweden's GDP - to “high-risk” countries, mainly in the Baltics, while the banking systems of many of the worst-hit economies, including those of Estonia, Slovakia and Lithuania, are now almost entirely foreign-owned.

While Raiffeisen and Erste Bank, of Austria, are regarded as the two institutions most significantly at risk, it is not just the Viennese who risk seeing their capital waltz off into oblivion. ING, the Dutch bank, Commerzbank, of Germany, and Société Générale, of France - which owns the Russian Rosbank - all saw their shares fall yesterday amid mounting concerns over their exposure to the region. Italy's UniCredit and Belgium's KBC are also heavily exposed.

Apart from the damage to some Western European banks, other companies may also be wounded, such as Telekom Austria, which expanded east amid tough competition in their home markets. And there are other ways in which contagion could spread. Manufacturers in Germany - the linchpin of that country's economy - will suffer as Eastern European rivals enjoy a boost in competitiveness as their currencies collapse in value against the euro.

The bursting of this bubble may damage Britain less severely than other EU nations. While Irish buy-to-let investors were buying up most of Bratislava, Austrian banks were buying their Romanian equivalents and German and French manufacturers were opening plants from Bucharest to Brno, the only British activity in the region seemed to consist of flying to such locations for stag weekends.

That is not to say that this crisis will not drop us in the goulash, too. The crisis was already highlighting the inflexibility of eurozone membership, particularly for those less competitive member states such as Italy and Portugal, who - unlike Britain and Sweden - are unable to devalue their way out of their problems. This has not gone unnoticed - and, in a speech last night, Lorenzo Bini Smaghi, the ECB executive board member, was muttering ominously that the ability of some EU countries to devalue their currency, gaining an economic advantage, was putting the single market's integrity at risk.

Taken to their logical conclusion, his comments sound dangerously like a call to protectionism.

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