en.wikipedia.org/wiki/Charlie_and_the_Chocolate_Factory

This date conflicts with authoritative bibliographic records for the book's British publication history.

• The Roald Dahl Archive describes the UK publication history for Charlie and the Chocolate Factory as the "publication of both (1967) by George Allen & Unwin Ltd" and also notes that Dahl's "first" children's book published in the UK was in 1967.
• Penguin's own sample-material bibliographic page for the book states: "First published in the USA by Alfred A. ... Published in Great Britain by George Allen & Unwin 1967."

So while the novel first appeared in the US in 1964, the UK version was published in 1967, not on 23 November 1964.

The timeline here is wrong. Bibliographic records show that Charlie and the Chocolate Factory first appeared in the United States in 1964, but the first British publication by George Allen & Unwin was in 1967.

That means the UK edition was issued years later, not "11 months later."

Evidence:

• WorldCat lists the 1964 first edition as Alfred A. Knopf, New York, 1964.
• Penguin's publication statement says the book was "First published in the USA" in 1964 and "Published in Great Britain by George Allen & Unwin 1967."
• The Roald Dahl Archive likewise describes the UK publication of Charlie and the Chocolate Factory as occurring in 1967.

Calling George Allen & Unwin the "original" publisher is incorrect for the book as a whole.

Authoritative catalog records show that the first edition was published by Alfred A. Knopf in New York in 1964. George Allen & Unwin handled the British publication later, in 1967.

So George Allen & Unwin was the first UK publisher, but not the book's original publisher overall.