Tilda Swinton and director Bong Joon-ho talk about class warfare, Margaret Thatcher and giant pigs as they explain how their 2013 collaboration, Snowpiercer, got made. A ‘mild-mannered man in a suit’ was how Bong Joon-ho’s script originally described the bureaucrat quelling an uprising in Snowpiercer, a post-apocalyptic thriller set on a train. Swinton delighted in transforming the role into a sadistic monster, complete with dentures and furs. Subscribe: http://bit.ly/subscribetotheBFI Watch more on BFI Player: http://player.bfi.org.uk/ Like us on Facebook: https://www.facebook.com/BritishFilmInstitute Follow us on Instagram: https://www.instagram.com/britishfilminstitute/ Follow us on Twitter: https://twitter.com/BFI