LONDON, ENGLAND - JULY 18: Two girls take a photograph of themselves on their mobile phone as they relax in the warm weather in Hyde Park on July 18, 2014 in London, England. The Met Office has issued a heatwave alert as temperatures soar to their highest of the year. (Photo by Oli Scarff/Getty Images)
LONDON, ENGLAND - JULY 18: Two girls take a photograph of themselves on their mobile phone as they relax in the warm weather in Hyde Park on July 18, 2014 in London, England. The Met Office has issued a heatwave alert as temperatures soar to their highest of the year. (Photo by Oli Scarff/Getty Images)
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