The publisher Hurst & Blackett brought out an English language edition of AH's book, Mein Kampf, in 1939.
It was, as George Orwell says in the review to which I'll link you in a moment, edited in an appeasementist spirit: 'see? Hitler's not so bad, maybe we can all get along.' A year later, the same publishers re-issued it, apparently with new prefatory material etc. because Britain and Germany had in the meantime gone to war.
I think Orwell's review, written in response to the re-issuance, holds up very well through all the intervening decades. I especially like the summary of the world Hitler wanted: " a horrible brainless empire in which, essentially, nothing ever happens except the training of young men for war and the endless breeding of fresh cannon-fodder."
Here's the URL: