Overview:3,500 years ago, an international demand for Cornish tin put Cornwall at the centre of an internation arms trade. Mixed with copper, Cornish tin made high quality weapons, giving birth to the British Bronze Age. Hermione Cockburn discovers what happened when American media mogul and inspiration for Citizen Kane William Randolph Hearst, made a run-down castle with a sea view into a little hideaway for him and his mistress on the Welsh coast. Neil Oliver visits Porthcawl to trace the history of the Welsh Great Escape.