Tim, it's a nice idea, but sadly there are so many variables that knowing if you are comparing like with like is impossible. You could just assume that the range of variables is the same for each police authority, but I'm pretty sure that'd be an unfair comparison. Added to that the fact that we may well not hear the full story in some cases, and you can see that creating league tables that fairly reflect how efficient each constabulary is in comparison with others is problematic to say the least.