Ant and Dec present the Britain's Got Talent final, in which one of the remaining contestants will be crowned 2012 champion. At stake for the acts is 500,000 pounds and the chance to perform at the Royal Variety Performance. After the hopefuls take to the stage one last time, viewers have the chance to vote for their favourite act to win. With judges Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams