Zac Goldsmith, U.K. ruling Conservative Party candidate for the role of London Mayor, left and Sadiq Kahn, U.K. opposition Labour Party candidate for the role of London Mayor, attend the launch of the London Housing Commission Report at the Geological Society in London, U.K., on Monday, March 7, 2016. The London mayoral vote takes place on May 5. Photographer: Jason Alden/Bloomberg via Getty Images
