We journey to the Farne Islands, home to immerse numbers of seals and seabirds, early Christian communities and the first attack by terrifying Viking raiders.
Starting on the Isle of Lewis in the Outer Hebrides, we visit the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses, and cut peat with a modern crofter.
At Rathlin Island, the third episode of Britain's Secret Islands visits a Neolithic stone tool factory, a unique 'upside-down' lighthouse, and a WWII shipwreck.
Along England's South Coast, we dive with blue sharks, explore the battlements of Drake's Island, uncover the origins of Scouts, and discover fossils on the Isle of Wight.