Alice Roberts and her fellow historians explore Britain's long-standing obsession with invasion, by examining the physical reminders that are still here today
Episode 1
Henry VIII - Going It Alone: The story of Henry VIII's fear of Catholic Europe, told via his castles, cannons and spies
Episode 1
Episode 2
Halting Hitler: How Britain planned for a Nazi invasion - from tank traps to a tragic story of heroism
Episode 2
Episode 3
Avoiding Armageddon: Tales of Cold War Britain, from nuclear threat to ghost bunkers and posh spies
Episode 3
Episode 4
The Norman Takeover: The rich, brutal story of William the Conqueror's journey from invader to ruler of England
Episode 4