How prepared was Britain for a Nazi invasion? The common perception is of a country woefully unprepared for war; hastily assembled defences manned by characters from 'Dad's Army', and a government unfit for the task at hand. But in reality, a top-secret training programme was underway to turn civilian volunteers into ruthless resistance fighters, saboteurs and assassins.

Dan is joined by historian Andrew Chatterton, author of 'Britain's Secret Defences', to discuss how Hitler's invasion of Britain might have been countered.

Produced by Mariana Des Forges and edited by Dougal Patmore.

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