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LONDON, ENGLAND - MAY 07:  Sadiq Khan attends an official signing ceremony at Southwark Cathedral as he begins his first day as newly elected Mayor of London on May 7, 2016 in London, England.  Khan, the Labour MP for Tooting, will be sworn in as Mayor of London at a multi-faith service at Southwark Cathedral today. After months of campaigning Mr Khan won the London mayoral race with 56.8 percent of the vote beating Conservative Party candidate Zac Goldsmith into second place.  (Photo by Yui Mok - WPA Pool /Getty Images)
LONDON, ENGLAND - MAY 07:  Sadiq Khan attends an official signing ceremony at Southwark Cathedral as he begins his first day as newly elected Mayor of London on May 7, 2016 in London, England.  Khan, the Labour MP for Tooting, will be sworn in as Mayor of London at a multi-faith service at Southwark Cathedral today. After months of campaigning Mr Khan won the London mayoral race with 56.8 percent of the vote beating Conservative Party candidate Zac Goldsmith into second place.  (Photo by Yui Mok - WPA Pool /Getty Images)

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