David dishes out advice to Simon Cowell! | Semi-Final 4 | Britain’s Got More Talent 2017

Stephen Mulhern takes calls from viewers at home, leading Simon Cowell to reveal what world record he’d most like to break, while David encourages the big boss to turn that frown upside down! See more from Britain's Got Talent at http://itv.com/talent SUBSCRIBE: http://bit.ly/BGTsub Facebook: http://www.facebook.com/BGT Twitter: http://twitter.com/BGT