Roy Jenkins, Churchill: A Biography (New York: Farrar, Straus and Giroux, 2001), p. 429:
The charge in its most literal sense is irrefutable. From at least this stage onwards Churchill never wrote out a book de novo. He depended on having his factual material not merely checked after he had written it, but as carefully prepared for him in advance as was the laying out of the instruments for a famous surgeon. When he transformed the basic material, by adding insights, comparisons, metaphors and flights of oratorical fancy, he mostly did so by dictation, normally the enemy of succinctness, and not by pen. Sometimes, as with many articles and with My Early Life, he would dictate the whole draft out of his head, and then very carefully correct it. He also acquired the odd habit of being unable to envisage the shape of a book without having it set up in printed proof at an early stage, and then hacking it about in a way that a modern publisher would regard as intolerably inflating his printing budget. Thus when, in February 1930, he was proposing to add about 40,000 new words to the 50,000 or more of My Early Life which he had already written (the number of literary balls he had in the air at that stage is staggering), he insisted that, at his own expense if necessary, the already written text must be set up in print – ‘until I see the existing material in type I cannot make progress’.13 Associated with this was his increasing desire to work standing up, for which purpose he acquired a sloping desk of appropriate height at the side of his Chartwell study. He needed the feel and look of printed proofs for his literary teeth, but he rarely worked at them seated at a writing table. It was nearly all done either upright or in bed.