Don't miss: Britain's Got Talent at 8:00pm on ITV London

Ant and Dec host the second semi-final of this year's talent contest, making a return to screens following the auditions episodes broadcast in the spring. Amanda Holden, Alesha Dixon, David Walliams and Ashley Banjo are on the judging desk"> Welcome to your daily update on the best shows to watch on TV. Email not displaying correctly? [View it in your browser]( [TV Daily - Your guide to everything new on TV - by TVGuide.co.uk] [TV Daily - Your guide to everything new on TV - by TVGuide.co.uk]( [MUST-SEE TV]( 12 September [Britain's Got Talent]( [Britain's Got Talent]( [ITV London] 8:00pm, ITV London Season 14 Episode 11 Semi-Final 2 [Ant and Dec host the second semi-final of this year's talent contest, making a return to screens following the auditions episodes broadcast in the spring. Amanda Holden, Alesha Dixon, David Walliams and Ashley Banjo are on the judging desk]( [More]( [Taskmaster]( [Taskmaster]( [Dave] 2:00pm, Dave Season 4 Episode 7 of 8 No Stars For Naughty Boys Greg Davies challenges Hugh Dennis to wield a blade, while Mel Giedroyc destroys a mannequin. Alex Horne helps coax the contestants [More]( [The Big Bang Theory]( [The Big Bang Theory]( [E4] 2:55pm, E4 Season 9 Episode 6 of 24 The Helium Insufficiency In the middle of a nationwide shortage of liquid helium, Sheldon and Leonard take desperate measures to obtain the supplies they need in order to prove a scientific theory before a rival ... 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