Presented by Rene Cutforth
The D-Day operation, codename Overlord, was probably the best kept secret of the whole war. Everyone knew it was coming but no one knew exactly when or where. German Intelligence was geared to finding out. Hitler's two most important codebreaks came from Churchill himself and the BBC. Churchill, through his scrambler telephone in Whitehall; and the BBC, through its coded messages broadcast to Resistance workers in France.