Free Thinking - TS Eliot poetry prize winner. Lisa Randall on dark matter.

Anne McElvoy talks to the winner of this year's TS Eliot poetry prize Sarah Howe - who won for her first collection; Anne talks to leading physicist Lisa Randall - author of Dark Matter and the Dinosaurs and explores new architecture with Douglas Murphy and Owen Hopkins. New Generation Thinker Jonathan Healey looks at what history can tell us about coping with flooding.