In a speech warning of the need for EU reform, Chancellor George Osborne said that EU rules on bankers' pay would lead to a "Fred Goodwin-style situation" in which money would not be recoverable
"These European rules will not lead to bankers being paid less," he said. "What they will lead to is a Fred Goodwin-style situation where you will not be able to get money back off bankers when things go wrong."
"That is precisely what we have been trying to get away from in Britain," the Chancellor added.
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The Office for National Statistics said gross domestic product grew by just 0.1%.
William's comments came during a surprise appearance at an event scheduled for just his brother.
Matt Campbell, who collapsed just a few miles from the finish line, had hoped to raise £2,500.