I was just looking at
this post on Dave Morris blog and read the following text which may fit good in this topic:
Dave Morris wrote:I don't recall there being a Heroquest world at the time I wrote the first book, so I created part of one and drew my own map of it. By the time I was asked to write the second book, Games Workshop had designed their own version of the world, which included some of the place names from my novella but with a quite different geography "loosely based on the Warhammer world" as it said in the front. I just mention that because if you refer to the map from the second book while reading the first, you will see that the route the characters take makes no sense. One view at the time was, "Well, it's for ten-year-olds," but I can tell you that when I was ten that sort of thing would've annoyed the hell out of me.