Ooh, interesting! Does not following PBP constitute a failing that should be flagged in and of itself? (I'm not being facetious here, I'm genuinely interested in what people think about this.) If so, to what degree? While I think PBP is a fantastic book, there are (to my mind) certain recommendations in it which can/should be ignored more readily than others and regarding the whole book as a "must-follow" sort of bible would pose more restrictions on module authors than I personally think sensible.