A television news camera trains its lens on number 10 Downing - Oli Scarff/Getty Images ©

A television news camera trains its lens on number 10 Downing - Oli Scarff/Getty Images ©

A television news camera trains its lens on number 10 Downing - Oli Scarff/Getty Images ©

A television news camera trains its lens on number 10 Downing - Oli Scarff/Getty Images ©

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