Read by Greg Patmore

The untold story of Bletchley Park's key role in the success of the Normandy campaign Since the secret of Bletchley Park was revealed in the 1970s, the work of its codebreakers has become one of the most famous stories of the Second World War. But cracking the Nazis' codes was only the start of the process. Thousands of secret intelligence workers were then involved in making crucial information available to the Allied leaders and commanders who desperately needed it. Using previously classified documents, David Kenyon casts the work of Bletchley Park in a new light, as not just a codebreaking establishment but as a fully developed intelligence agency. He shows how preparations for the war's turning point-the Normandy landings in 1944-had started at Bletchley years earlier, in 1942, with the careful collation of information extracted from enemy signals traffic. This account reveals the true character of Bletchley's vital contribution to success in Normandy and, ultimately, Allied victory. PRE-INVASION INTELLIGENCEFOREWORDBLETCHLEY PARK'S CONTRIBUTION TO THE PREPARATION FOR OVERLORDULTRA'S USESCOTENTINTHE GERMAN DEFENCESALLIED PLANSNAMING SOURCESAN INTELLIGENCE AGENCY IN ITS OWN RIGHTENIGMAORIGINS AND EARLY DAYS7 Getting ashore: Operation NEPTUNE and the landings4 Invasion planning in 1943: the Western Front Committee1 The intelligence factory8 Staying ashore: the Normandy CampaignTHE NEED FOR DECEPTIONTHE VALUE OF FISH2 Incoming intercepts and codebreakingRECORDING THE GERMANSINTERCEPTING ENEMY COMMUNICATIONS DIRECTLYFEEDING THE MILITARY HIERARCHY5 Invasion planning in 1944: SHAEF and JELLYFISHLORENZ AND FISH: HEATH ROBINSON AND COLOSSUSOMAHATRACKING GERMAN SUSPICIONSBLETCHLEY PARK'S CONTRIBUTION AFTER THE INVASIONIntroduction: Overture to OVERLORDORDINARY PEOPLE, EXTRAORDINARY WORKTHE FIRST TWENTY-FOUR HOURS21. PANZER-DIVISIONBLETCHLEY PARK'S ROLE CHANGESTHE FINAL VERDICTGERMAN MISUNDERSTANDINGS9 The importance of Bletchley Park to OVERLORD3 Outgoing intelligenceJAPANESE DIPLOMATIC CODESHUTS AND BLOCKS6 Understanding German expectationsPART I BLETCHLEY PARK IN 1944INTERCEPTING THE JAPANESECONTINUING JAPANESE TRAFFICRECEIVING AND DECEIVING THE ABWEHRTRAFFIC ANALYSISCLEAR SUCCESSES AND CONTROVERSIESPART II PREPARATIONS FOR INVASIONY STATIONS AND OUTSTATIONSRELATIVE VALUEA CLEARER VIEWORDERING THE BATTLEPART III INVASION AND AFTERTHE EARLY DAYS OF BLETCHLEY'S COMMUNICATIONSDISCERNING THE GERMAN STRATEGIC RESPONSETHE HEART OF THE OPERATIONCOMMUNICATING WITH COMMANDERS IN THE FIELDA SPECIAL INTELLIGENCE RELATIONSHIP

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