Free Thinking: The Day of the Triffids

John Wyndham's 1951 story The Day of the Triffids explores ideas about bio-engineering and nature, despotic government and attempts to control, and whether colonies can survive outside the mainstream. Matthew Sweet and guests Amy Binns, Tanvir Bush, Peter White and Sarah Dillon look at the novel, which spawned film, TV and radio adaptations and discuss what resonance it has today