Ant and Dec host the fourth audition show, as the judges - Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon - give their verdicts on more of the nation's best, and worst, performers. Queuing up to take the stage, acts of all ages and abilities are determined to prove they're worthy of the £250,000 cash prize and a slot at this year's Royal Variety Performance, but while some of them will be deserving, the dream will be over for those whose auditions are cut short by the panel
