Four places in the final have been filled already, by Collabro, Darcy Oake, Addict Initiative and James Smith, and now another nine acts take to the stage in a bid to win the next two slots. Only the most impressive among them will have a chance of performing for royalty later this year, and the judges - Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon - can still buzz off a disastrous contestant even at this point in the competition. Ant and Dec are the hosts.