Mayor of London, Boris Johnson arrives to speak at a Conservative Party election rally in Hendon in north London on May 5, 2015. Britain's political leaders today began a final push for votes ahead of Thursday's knife-edge election, even as they prepared for the likelihood of protracted coalition talks once polls close.    
AFP PHOTO / POOL / Toby Melville        (Photo credit should read TOBY MELVILLE/AFP/Getty Images)