David Cameron Joins Zac Goldsmith For Final Hours Of Campaigning To Be London Mayor

LONDON, ENGLAND - MAY 03: (L-R) London Mayor Boris Johnson; Conservative candidate for Mayor of London, Zac Goldsmith and British Prime Minister David Cameron attend a mayoral campaign rally at Grey Court School in Richmond on May 3, 2016 in London, England. The Prime Minister joined the Conservative Mayoral candidate at Grey Court School on the penultimate day of campaigning. Former pupils of the school include London's Cycling Commissioner, Andrew Gilligan. Londoners go to the polls on Thursday 5th May with the declaration expected later on Friday 6th. The current Mayor of London is the Conservative MP for Henley, Boris Johnson. (Photo by Jack Taylor/Getty Images)