In the early hours of 30 April, 1943, the most audacious hoax of World War Two has just got underway. Its code-name - Operation Mincemeat.

The body of a British naval officer, Major William Martin, has been washed up on a Spanish beach. The dead man is carrying top-secret papers revealing details of a planned Allied invasion, and it’s not long before they fall into enemy hands.

But the plans are false and Major Martin doesn’t exist.

In a daring mission, British naval intelligence has requisitioned a corpse and dressed him in uniform to plant fake information. It works.

But for decades, no-one knew the real name of the man who’d played the biggest part: Major William Martin.

Enter Roger Morgan, an amateur historian. He tells Jane Wilkinson how Operation Mincemeat unfolded and how he uncovered the major’s true identity.

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(Photo: William Martin's ID card. Credit: National Archives, Kew)