During their visit to the Bank of England and their discussion of the 2008 financial crisis, the London Evening Standard reports that the Duke of Edinburgh told staff: "There's not another one coming, is there?" before adding: "Don't do it again."
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British soldiers will join troops from some 30 countries who work in the country.
The demand comes after the Prime Minister urged a "grown up" relationship between her government and the devolved administrations.
The rapper failed to make it to London in time as he had problems with his passport.