Sadiq Khan, the Labour Party candidate in London’s mayoral election on Thursday, posed for photos last month outside New Scotland Yard. Credit Andrew Testa for The New York Times
LONDON — The son of a London bus driver, Sadiq Khan has had a remarkable rise into the upper echelons of British politics. He grew up with seven siblings in a three-bedroom home in public housing and attended state schools before becoming a human rights lawyer and then a senior government minister.