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The coded message was sent by Peter Gardner in a letter that was addressed to his mother and which accompanied a photo of an old school friend . Above: The tiny coded message with the photo.
The recently unearthed secret missive casts fascinating new light on how - right under their Nazi captors noses - Allied POWs communicated with the intelligence services
A prisoner of war held in the Nazi camp that inspired the 1963 film The Great Escape sent a secret message to military intelligence hidden in a letter to his mother.
Blow Your Own Trumpet: Children's drama, starring Michael Crawford. Blow Your Own Trumpet airs on Talking Pictures TV at 5:15 AM, Wednesday 24 January. Children's drama, starring Michael Crawford