Derek Walcott , who was awarded the Nobel Prize for Literature in 1991, is admired not only for his own poetry but also for his insight into the work of others. He talks to Richard Coles about his new collection of essays, What the Twilight Says, which includes pieces on writers as diverse as Hemingway, Larkin and Joseph Brodsky. He also reads some of his own poetry.
And as the 80th anniversary of the end of the First World War approaches, historian Niall Ferguson sets out to overturn many generally accepted views of it. In his controversial account, The Pity of War, he argues that conflict between Britain and Germany was not inevitable and that Britain's intervention turned a continental war into a global conflict. He debates his position live in the studio. Producer Doug Traill - Stevenson