On Start the Week the journalist Ian Cobain reveals how torture has been systematically used by the British from WWII to the War on Terror, via Kenya and Northern Ireland. David Anderson QC reviews the risks posed by terrorism in the UK. Extraordinary rendition and the language of concealment form the heart of Clare Bayley's new play, and there are more secrets uncovered by the criminal barrister-turned-crime writer, MR Hall. Producer: Katy Hickman.