The content of this book does not justify the price. The list of the large number of individuals involved in putting this publication together should have preceded a weighty repository of information to add further detail to the course content of PRINCE2, MSP, etc. For a body of knowledge it is pitched at too high a level, and lacks detail. It does provide an extensive further reading list, but that's about it. My advice...don't bother.
At £45 I was expecting a lot of detailed knowledge, not glib summaries of a perfect world and references to everyone else's work. This was to me a complete waste of time and money. No tools to use, no structure to approach projects with, no checklists, just chat and lists of other people's books to read.
If this is the body of knowledge for the APM all I can say is the APM doesn't know much, it seems that this is just a large catalogue for other books with a small bit of low level detail between each catalogue section.
There are comments in other reviews that the information in this book is glib and meaningless. In many ways this is irrelevant. If you wish to pass any of the APM qualifications, you will need this book. That is all there is to it.
However, I must say I agree. This book is very light on detail. I rate the PMBoK rather more highly, or one of the all-in-one methodologies like PRINCE2.