The Labour party shadow chancellor Ed Balls (C), Labour party parliamentary candidate for Leigh, Andy Burnham (R), and Labour candidate for Leicester West, Liz Kendall, attend a press conference to launch the party's "NHS Week" and unveil a new campaign poster for the general election in London on April 20, 2015. Britain goes to the polls to elect a new parliament on May 7. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
