We are now getting used to hearing that the UK is the worst-placed among the G20 countries to recover from the credit crunch. One reason is that we have few banks, and almost all of them in trouble.
By contrast, as you see here, the US has 8,500 banks, most of them in good condition. The problems are concentrated in their handful of giants. Over there, it would be possible to bust them and have others ready to take on their books of loans (discounted) and deposits.
Here, I think we'd have to create a new bank, if only to provide some competition for Barclays and HSBC.