Ant and Dec return with a fresh search for the nation's brightest new star, and there's a new addition to the judges' desk in the form of the golden buzzer, which gives Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon the power to send an act straight through to the live semi-finals regardless of their fellow panellists' opinions. However, they can each press it only once during the series. Leaving no stone unturned, the auditions visit London, Cardiff, Manchester, Birmingham and, for the first time, Belfast, as a wide variety of acts, from comedians to contortionists, singers to spoon players, compete for the chance to win £250,000 and a slot at this year's Royal Variety Performance