Martin Simpson performs some of the songs from his new album “Rooted” and talks to Matthew Bannister on the Big Barn stage at the BBC Countryfile Live event in the grounds of Blenheim Palace in Oxfordshire. Martin says he is motivated to write songs by “love and anger” and reveals that recording his episode of Folk on Foot was a “surprisingly emotional experience”. He also tells the story of Ken Small whose determination to uncover a second world war tragedy became an obsession.