Standing tall way out into the Thames Estuary are strange looking towers.

These were built during the Second World War to defend the entrance to the river and London beyond.

The Maunsell Forts are named after their designer, Guy Maunsell who created two types used in the Thames Estuary.

Following the World War Two, the forts lived on. Rough Sands Fort, sited some 13 kilometres from the Essex coastline becoming home to a pirate radio station and the Principality of Sealand.

Flo McEwan is a Thames Estuary historian, photographer and she's the Duchess of Sealand.

Flo joined Owen to talk about the history of these magnificant structures that many have only ever seen in pictures.

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