Since rising to fame fronting kids' programmes, Stephen Mulhern has become a staple of Saturday night TV. The Londoner is a contributor to Ant and Dec's Saturday Night Takeaway, previously hosted ITV2's Britain's Got More Talent, and now has not one but two of his own entertainment shows - In For A Penny and Rolling In It. The latter was a runaway success when it debuted on ITV in August last year, achieving audiences of almost four million - and is now returning for a second series this month. So, how does Rolling In It work? Well, every episode stars three celebrities, who are each paired with a contestant from the general public.