The fourth series of British talent competition programme "Britain's Got Talent" was broadcast on ITV, from 17 April to 5 June 2010; due to live coverage of the 2010 UEFA Champions League Final on 22 May, the sixth audition episode of the series was pushed back a day to avoid clashing with it. Production on the fourth series during the filmed auditions required Louis Walsh to step in as a guest judge, after Simon Cowell became ill and unable to partake in certain sessions.