From the early 1930s we knew what Hitler’s intentions were – so why were we so ill-prepared?

MI6’s historical archive suffered disastrous weeding on grounds of space from the 1920s onwards. One of many mysteries was the identity of a 1930s/40s agent referred to cryptically in surviving papers as ‘C’s German source’ (C being the chief of MI6). Now, as a result of indefatigable research, Tim Willasey-Wilsey has established who the man was who almost uniquely reported on the thinking of Hitler’s pre-war inner circle.