Brother and sister Leanne and Billy from Stamford try to spot the imposters and win £10,000, with help from celebrity investigators Jimmy Carr, Alison Hammond and Amanda Holden. But with a line-up including a singing student and a personal trainer it may be harder than they think! This week's guest star is Louise Redknapp.

In this episode, brothers Joe and Dan from Middlesbrough are hoping to spot the impostors and win £10,000. But with a line-up including a singing scientist, a prison officer and an electrician, it may be tougher than they thought. The music star in this episode is Alexandra Burke.