In fact, it's a fairly comprehensive summary of all the rules / procedures, adds some new info, and if you just VFR GA traffic, large sections of it do not apply.
The basic procedures can be described in one or two pages. In fact, the CAA has done just that and made sure those leaflets were sent along with magazines such as Flyer.
However there are numerous exceptions for various airfields, operators and kinds of operations. If the CAA would NOT have published a comprehensive, 114-page guide ("bible" would be more appropriate) with all the exceptions, we would all be bitching about that there's not one single document which contained everything.
From my viewpoint from across the pond, I can only say that I find the way the MoD, CAA, AOPA and various other organizations involved have handled this remarkable. The security requirements that are laid down by the IOC are incredible and the fact that GA is allowed with, as far as I'm concerned, relatively few restrictions and procedures, is remarkable.
I seem to remember that in Greece, four years ago, GA was simply banned altogether, except for media helicopters covering the event.