Darfur tribesman Daoud Hari’s community was destroyed by Sudanese government-backed militias in 2003. He talks with human rights lawyer Chris Nugent about the conflict and his ‘treacherous’ work as a translator for the aid agencies and journalists. Tim Butcher discusses his extraordinary and audacious Congolese adventure Blood River: A Journey to Africa's Broken Heart, which has been longlisted for the Samuel Johnson Prize. Chaired by Paul Blezard.