Appropriately, the Luftwaffe messages so laboriously and expensively deciphered at Bletchley in March 1940 turned out to consist mostly of nursery rhymes sent as practice transmissions.
Even there, where at least they were busy with very exciting work, a sense of unreality and anticlimax was often felt.
It was the same at Cambridge.
Alan would return there occasionally for leave days, to work on mathematics and to see friends.
At King's they had all dutifully trooped down into air raid shelters (all except Pigou, who refused to compromise with the Luftwaffe), but the promised bombardment had not come.
Three quarters of the children evacuated to Cambridge had returned home by mid-1940.
Yet the war had not been over by Christmas;
Alan had exercised his option to suspend his fellowship for the duration of the war on 2 October 1939, and although his course on the Foundations of Mathematics had been advertised in the lecture list, it was not to be given.