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Incredible tales of derring-do feature in David Jason’s history of Britain’s spies David Jason, it turns out, is obsessed with spies.

His love of espionage is at the centre of this new series in which he explores the history of British spying from the early 20th Century to the modern day.

Episode one begins with the formation of the British Secret Service in 1909 by maverick spy master Sir Mansfield Cumming – code name C – who turned a group of amateurs into the country’s first secret agents.

Five years later when World War One broke out, their spying was pivotal to the Allied victory.

Belgian refugees were recruited as they arrrived in Britain and Folkestone became a key battleground for British spy organisations.