LONDON: Londoners choose their new mayor on Thursday after a straight fight between rival candidates Zac Goldsmith and Sadiq Khan dominated by negative campaigning. In the contest to replace the charismatic Boris Johnson in charge of the British capital, polls put Labor candidate Khan comfortably ahead of his Conservative rival as they enter the final straight. The two main contenders are cut from different cloth. Environmentalist Goldsmith, 41, represents west London’s affluent Richmond Park in parliament. He is a son of the late tycoon financier James Goldsmith, who left £1.2 billion ($1.75 billion, 1.5 billion euros) in trust for his family. Khan, 45, meanwhile, is the son of a Pakistani immigrant bus driver who grew up to be a human rights lawyer and government minister. He is the MP for Tooting in south London, where he was born and raised, and which has a large population with Asian roots.