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LONDON, ENGLAND - MAY 25: Sadiq Khan attends his first Mayor's question time at City Hall on May 25, 2016 in London, England. The new London Mayor, elected in May, answers questions from the Assembly in public on Londons economy and the EU, affordable rents and housing and FGM at his first Mayors Question Time. The Mayor is questioned by the Assembly ten times a year to hold his administration to account. (Photo by Dan Kitwood/Getty Images)

LONDON, ENGLAND - MAY 25:  Sadiq Khan attends his first Mayor's question time at City Hall on May 25, 2016 in London, England. The new London Mayor, elected in May, answers questions from the Assembly in public on Londons economy and the EU, affordable rents and housing and FGM at his first Mayors Question Time. The Mayor is questioned by the Assembly ten times a year to hold his administration to account.  (Photo by Dan Kitwood/Getty Images)