Back in 2010, the IMF, using BIS data, built a network model showing the ramifications of a UK failure. 
On a related topic, the disproportionate size of Switzerland’s banking system relative to GDP, an overvalued exchange rate, and complacency among investors, sets off alarm bells.
Last year, the WSJ had an article on the safe haven status given to Switzerland.
“In 2010, Swiss banking assets were equivalent to more than 700% of GDP. Only Ireland and Luxembourg exceeded this proportion. A systemic banking crisis caused by sovereign defaults in the euro zone would have a disproportionate effect on the Swiss economy. One strategist working for a Swiss bank drew wry comparisons between Switzerland and Iceland, whose economy was crushed by its own overly large banking sector.”
The banking system in the United States is but a fraction, something like 10-20% if I recall. Imagine the amount of money printing the Swiss would need to bail out their banks.
Financial Network Analysis, Google, WSJ
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