During a visit to the bank of England earlier today the Queen suggested the 2008 financial crisis was partly brought about by the fact that the City regulator, the FSA, "didn't have any teeth. " Royal Correspondent Tim Ewart reports.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.