The League of Gentlemen on returning to Royston Vasey for their 20th anniversary

Mark Gatiss, Reece Shearsmith, Jeremy Dyson and Steve Pemberton (AKA The League of Gentlemen) visit the BFI Southbank to introduce series four of their comedy-horror show, a three-part return to Royston Vasey that is being broadcast 20 years after the sketch comedy first appeared on radio.