Prime Minister David Cameron Visits 'Blood Swept Lands and Seas of Red' At The Tower Of London [Getty Images]

LONDON, ENGLAND - NOVEMBER 8: British Prime Minister David Cameron and his wife Samantha Cameron visit the Tower of London where they each lay a poppy at the art installation 'Blood Swept Lands and Seas of Red' by artist Paul Cummins which marks the centenary of the First World War on November 8, 2014 in London, England. (Photo by Stefan Rousseau - WPA Pool / Getty Images)

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