After trawling through numerous screenwriting books in the shop (sorry amazon, it was waterstone's), I finally decieded to plump for the one with the quotation "the guru of all screenwriters" on the cover. In hindsite I should have noted that this attests to the ability of the author as a screenwriter, not the quality of the book. And with good reason. In case my review title didn't make the point, i felt i was covering the same ground in chapter 12 as i did in chapters 1,2,3... Action, character, conflict and not much more.
If made compact (and it could easily have been cut in half) it could have made a decent effort to motivate novice screenwriters (like myself) beyond writing blocks and the like, as well as introduce one or two technical principles. However, it is far too long considering the depth of the material.
Moreover, given the quality of the overall language and structure of the book, it's a wonder how he ever managed to put pen to paper in a profitable way at all, be it to sell a script or to sell a book on the back of having sold a script. I wish i had purchased any one of the other books on the shelf; One to avoid.