As a lifelong Hammer fan, I am always ready to consider initiatives connected with their films. Adapting a book version from a movie doesn't always work though, and this is really the case here. It is inevitable that the author will always need to use some artistic licence, and Hutson has apparently drawn his from deleted scenes and additional bits from the script.
It does make for an entertaining read, but with Hammer, I feel the effort would have been better spent on producing a graphic novel. Looking back at the "House of Hammer" magazines of the 70s is proof alone of what can be done to reproduce the back catalogue in a different format.