Overview: On Holy Island, we find out how a Viking attach inadvertently united the Anglo-Saxon kingdoms, creating a new national identity as they came together to resist a new enemy. Mark Horton navigates to Marine Esplanade in Ravenscar in search of the "town that never was". Destined to be a buzzing Victorian seaside parade, Mark uncovers why it is now just an empty field. Following three unsuccessful attempts to land a boat on Bass Rock, Miranda Krestovnikoff beats Neil Oliver to the challenge and is rewarded with a front row view of the diving gannets.