**FILE PICTURE- David Cameron and Boris Johnson will will campaign against each other ahead of an EU Referendum on June 23rd, 2016**© Licensed to London News Pictures. 07/07/2015. London, UK. DAVID CAMERON and BORIS JOHNSON leaving the service. . A church service held at St Paul's Cathedral In London on the 10th anniversary of the 7/7 bombings in London which killed 52 civilians and injured over 700 more.  Photo credit: Ben Cawthra/LNP
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