"I would have wished that I could write in some detail of the nature of our work in those wonderfully exciting days. For we were regularly reading the highest grade cipher messages passing between the German High Command and a the senior echelons of the German army, the German navy (including the U-boat fleet) and the Luftwaffe; moreover, we were reading those messages within a few hours of their original transmission. We were thus able to provide as perfect and complete picture of the enemy's plans and dispositions as any nation at war has ever had at its disposal — not lightly did Churchill described our work as his "secret weapon," far more potent than anything Werner von Braun could deploy against us. Unfortunately, the British government currently is behaving in a remarkably paranoid fashion with respect to the revelations of "secrets" by those who at some time (as, of course, I had to do) taken an oath of confidentiality."
January 1, 1970
https://en.wikiquote.org/wiki/Peter_Hilton