Presented by Professor Alice Roberts, Dr Onyeka Nubia and Professor Dan George, Fortress Britain looks at key moments in British history where the country has been under threat of foreign invasion, and identifies the physical reminders that remain to this day.

From the Normans to the Nazis, the island nation of Britain has been constantly threatened by invasion. Some invaders were successful, others never quite made it. All have left their mark. Alice Roberts and her fellow historians explore Britain's long-standing obsession with invasion, by examining the physical reminders that are still here today.
While some invaders succeeded, others failed; some didn't ever get near British soil, but nearly every threat has left its mark. From mighty Tudor forts on the South coast and giant WWII tank traps hiding in plain sight behind a leisure centre in Guildford to Norman castles that have stood for a thousand years and the giant network of tunnels outside Fife intended to help the nation survive a nuclear attack, the physical reminders of the threats posed to Britain over the centuries pepper our towns and countryside.
Each episode unpick the threats from a different would-be force of invaders, looking at who, what, how, why and when. Alice Roberts is based at the Fortress Britain hub in Walmer Castle, where she is joined by leading experts who'll set the scene for each period, introduce the key historical players and showcase some extraordinary historical artefacts. Onyeka Nubia and Dan George are travelling the UK visiting the buildings, battlefields and ruins that tell the story of Britain's struggle against invasion. How much has invasion shaped the British nation?

Series Producer / Director: Dominic Bowles ; Produced by IWC Media with Brainchild Productions and Brightshade Media for Channel 4

Part 2: Halting Hitler
How Britain planned for a Nazi invasion - from tank traps and sticky bombs, to the Home Guard and tragic story of heroism.
Alice Roberts looks for visible traces of Britain's rearmament in preparation for a German invasion. How did the Home Guard come about and what was the role of women in the offensive defense? We meet Indian-American Noor Inayat Khan, a special agent who worked with sabotage activities in German-occupied France, and hear her tragic story as one of the war's forgotten heroines. Alice learns about the deployment of the Home Guard, and Danielle travels to the Channel Islands, the only part of the British Isles under German control, to visit the only concentration camp built on British soil in Alderney. She explores life under occupation and visits the underground hospital Festung Guernsey.

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