Don't know about the CPS but after 17 years working with various TFU's etc. I know about Armed Police and how they have to approach these situations. Do you have a personal issue with the Police by any chance?
As I believe I have posted before, I work with three 'Southern' Police Forces in their Firing Ranges and over the past 15 years or so have got to know many, many Armed Response Officers.
Almost without exception the last thing the ones I have known is to fire their weapon in a 'live'...