Got it, loved it.
You should buy this. I'm glad I did. It goes into a fair bit of detail on the individual missiles' internal workings (more so than any other book I've read), troubles the weapons had and so forth, and then broadens out into a potted history of RAF Valley, including the aircraft which used the range, the target vehicles, individuals' personal recollections of their involvement in the projects (which include direct relevance to technical issues with the weapons), and so forth. The work goes beyond the weapons used by the British, e.g. the post-Berlin-Wall Luftwaffe sent over a MiG-29 to clarify carry, release and performance issues with AA-11 missiles. I'd hoped for mention of Red Dean, but alas nothing - I don't have access to Forbat's book right now (moved overseas, waiting for my stuff), and I can't remember whether the trial firings used this range or another, and it may be that the authors chose to restrict their attention to those weapons which actually entered "service" (even if in restricted form, in the case of Fireflash).
Some details of course are missing, because they relate to weapons still in service at the time of writing, but one gets the feeling that the authors really are saying "We know, but we are obliged not to tell you" as opposed to "we couldn't find this information".
There's a CD in the back, but I haven't had a chance to look at that yet.