This is the definitive recollection of events that lead to the creation of 2000 AD and its flagship character.
Published by Lisa Mills though their Millsverse imprint as an ebook available mainly here and here.
Here is its revised cover:
An audio book edition, read by Pat Mills himself is available at the Spokenworld audio website:
The paperback edition is described here.
As it description, frankly it is all in the title!
An excerpt from the book was published in Judge Dredd Megazine #385.