Ant and Dec present the first live semi-final, which sees the first set of nine acts compete to impress the judges and secure the all-important viewers' vote. At stake is the chance to appear at this year's Royal Variety Performance and win a life-changing cash prize of £250,000, but first the contestants have to win one of two coveted places available in the final. And if things don't go to plan on stage, the hopefuls can still be buzzed off - so the pressure is on to prove they've got what it takes.