Reading documentation and writing up a summary for a complaint

Description of legal work: I have documentation which I feel proves a police officer lied in a witness statement. I require a legal opinion on whether she has based on the notes I've made, a summary on the ramifications and a way forward. This may be back to the Investigating Officer or to the courts of she has perverted the course of justice.

I made a formal complaint regarding a police officer's witness statement. The investigating officer did not take any action, however information in his notes suggest 2 different stories on the same day by the same person

To read the documentation: 15 mins maximum

I would like something in writing but I'm happy with notes or emails and I'm quite happy with a skeleton that I can add to to sort myself
Extra notes: