He might well have admitted that for certain problems, the analogue solution could not remotely be rivalled by a digital method.
Putting a model aircraft in a wind tunnel would immediately produce a picture of stresses and vortices that centuries of calculation would never obtain.
In 1945 there was plenty of scope for debating the relative practical usefulness of analogue and digital devices, and the priorities for construction.
But so far as Alan Turing was concerned, this was a debate for other people.
He was committed to the digital approach, flowing out of the Turing machine concept, and with its potential universality at the centre.
No analogue machine could lay claim to universality, such devices being constructed to be physical analogies of particular problems.
It followed that his ideas had to find their place among, and compete with, the prevailing developments of digital calculators.
There had been machines to add and multiply numbers, the digital equivalents of the slide rule, since the seventeenth century.
Alan had a desk calculator at Hanslope, and used it for the calculation of circuit properties.
It was a very long step indeed from such devices to the idea of a practical universal machine.
But as Alan knew by this time, that step had been made a hundred years before, by the British mathematician Charles Babbage (1791-1871).
He used to speak to Don Bayley of Babbage, and knew something of what Babbage had planned.