Nicholas Crane presents a 13-part journey around the coast of the UK, uncovering stories that have made us the island nation we are today. He travels along England's north east coast, uncovering the violent past of Berwick and retracing the footsteps of Irish monks who played a big role in rejuvenating Christianity in England. Mark Horton visits Bamburgh Castle, while Alice Roberts embarks on a project to rebuild Britain's oldest house.