Izzy..........you raise some very good points.
I think one of the problems is that, in this age of instantaneous information, people want instant results. Investigating crimes which took place over several decades with little collaborating evidence, is extremely difficult.
In many ways this is just the beginning of unravelling Savile and his actions, and the actions of those around him. Running around charging others just to appease a 'hungry' public who demand instant answers and actions, without putting together solid cases is dangerous.
Personally, I would rather the Police work methodically than bow to public pressure