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The Real 'M': Following a trail from the birth of the Secret Service in 1909, to a hotbed of espionage in a sleepy seaside town, David uncovers the incredible stories of the Belgian refugees who became Britain's first professional secret agents, as he goes behind the lines in Belgium with La Dame Blanche, the most successful spy network of the Great War.

Starring: David Jason.
US TV RATING: TV-14