The best acts from boot camp have been split into four categories and are now competing for just 12 places in the live shows, down from last year's 16 (but really it could be 16, as there's talk of wild card contestants on Sunday's episode). Arriving at glamorous locations around the world, Gary Barlow is joined by Cheryl Cole as he auditions the over-28s at an English stately home, Nicole Scherzinger and Ne-Yo are in Dubai with the boys, and Tinie Tempah assists Tulisa choosing the girls on the Caribbean island of St Lucia, while there's a shock for the groups as Sharon Osbourne helps Louis Walsh in Las Vegas.