I have a sneaking feeling that if the complaint had been made against some not very well known tweeter that the police might have done one of those long drawn out investigations as to the merit of the case, involving seizing computers etc..
But suspect even if there are a few rainbow flag wavers in Northumbria police, that the idea that they could get away with the process is the punishment tactic against JKR just wouldn't be thought possible. Knowing she would give daily updates on the "process".
However, whatever the reason they are not proceeding, ie not even compiling evidence for the CPS to decide on, could become a significant mile stone.
And hopefully more people could feel reassured about this even if the BBC thinks it can punish a presenter for referring to someone by their biological sex.
Seems like another win to add to JKR's score card? 