He even managed to combine running and chess.
He saw something of David Champernowne from time to time, either at Oxford, where he now had a position, or at his parents' house at Dorking.
They would play ping-pong, and talk about probability theory, but they also devised a form of chess in which each player had to make his move while the other ran round the garden.
Fast running would tend to prevent good thinking, so the problem was to choose the right balance.
Alan was also interviewed by the Sunday Empire News on training hints.
He might have remembered the discussion of 'second wind' in Natural Wonders, which explained how it depended upon 'teaching' the brain not to 'raise such a row' when it smelt a little carbon dioxide in the blood.
One of the difficulties of his position was that there was a good deal of carbon dioxide in the blood supplying the British brain.
For all the talk of planning for the future, there was a terrible exhaustion after the war, and little eagerness to upset the apple-cart any further.
At Hanslope, Don Bayley had continued to improve and test the Delilah.
Later in 1945 he had taken it to Dollis Hill for evaluation where—hardly surprisingly—they failed to find any cryptographic weakness.
In early 1946 he had taken it to the Cypher Policy Board, which was a coordinating organisation established in February 1944.
He set it up in the basement of their London offices, and left it with one of their officers.
They were more interested than the Post Office, and suggested to Gambier-Parry that his man might join them to continue work.
But Gambier-Parry turned this down, and this refusal closed the story.
The Delilah's two neat packages of equipment, providing speech security with no more than thirty valve-envelopes, were completely forgotten.
As a contribution to British technology it had been a complete waste of time.