The quotation is bogus and there may not have been much to cut.
There's no evidence that Churchill said this
According to the Telegraph the quotation is bogus.
Spend enough time on Facebook or Twitter and you'll eventually come across a quote which purportedly emerged from that bulldog visage in the darkest days of World War II. It has Churchill responding ...
According to Quote Investigator, the following joke was published in the Oswego Daily Times on 18 November 1899.
The “Listener” reports the following from the subway: On one of the recent warm days a sour-visaged, fussy lady got on one of the smoking seats on an open car in the subway.
Next her sat a man who was smoking a cigar. More than that, the lady, ...
There is no reason to doubt that Churchill explicitly mentioned Rolls-Royce in the context of the quote.
A Google Books search limited to books published before 1960 returns at least four publications that feature the Churchill quote including the Rolls-Royce reference:
Jackson, G. G. (1930). The world's aeroplanes and airships, p. 173.
IPC Transport Press ...
It appears he said it in A History of the English - Speaking Peoples, Vol. 2 The New World.
A short paper authored by Calvin George in 2009 quotes the book directly
If the adventurers took books with them they took the Bible,
Shakespeare, and later The Pilgrim’s Progress, and the Bible they
mostly took was the Authorized Version ...
According to The National Churchill Museum he said
"Those who can win a war well can rarely make a good peace, and those who could make a good peace would never have won the war."
1930, from his book My Early Life.
Which doesn't mean exactly the same thing but has a similar sentiment.
In a speech in Parliament he also said, Of his predecessor ...