LONDON, UNITED KINGDOM -  APRIL 16: SNP leader Nicola Sturgeon takes part in the Live BBC Election Debate 2015 at Central Hall Westminster on April 16, 2015 in London, England. The leaders of five political parties are taking part in the election debate, without Prime Minister David Cameron and Deputy Prime Minister Nick Clegg. Britain goes to the polls in the General Election on May 7. (Photo by Stefan Rousseau - WPA Pool/Getty Images)
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