In 1938 the British Government's Code and Cypher School moved to Bletchley Park and laid the foundation for Britain's best kept secret: an organisation that would be instrumental to shortening the war and turning it in the Allies' favour. From this quiet backwater, a dedicated team began to unpick enemy codes, including Germany's 'unbreakable' Enigma code - unlocking intelligence of immense strategic value. So covert was the operation, German high command believed that Enigma remained unbroken throughout the war. Only in 1975 did the story begin to be known.

Ted Enever traces the Park's early history and provides a guide to the key wartime buildings and what went on behind the scenes. In this fully revised and updated edition, he describes the Bletchley Park Trust's battle to acquire the Park and thus preserve this historic site for the nation. Illustrated with rare contemporary photographs, Britain's Best Kept Secret is a must-read for anyone interested in the Second World War.