OP - You really do have a persecution complex! Everyone's against you - or so you perceive. You really are your own worst enemy.
You cannot seriously expect to walk into a teaching job after such a long break. Skills fade - every employer knows that.
My friend's daughter qualified as a NQT 2 years ago. She was complaining that she cannot get her first teaching job. That's strange, if you consider that all teaching jobs go to NQTs.
I looked at Warrington Council's current job vacancies. There are 11 teaching jobs advertised. So they obviously recruit directly and not, as you're saying, only via agencies.
So that makes me think you need to take a long hard look at why you're being selected for interviews.
I'd start with your CV. Ask a teacher who is currently employed to see if it's up to spec - not a career advisor from the Job Centre who knows bugger all about what a 'good' CV for teaching should look like i.e. the 'in' buzz words etc.
But I'd also look at other work. I'm 55. I shall be redundant by Christmas. I'm optimistic because, despite being in a senior role with a high salary, I shall look for all sorts of possible work. I don't mind cleaning!
But just bemoaning perceived slights against you by the world and his dog and becoming bitter to the point of paranoia, is not going to get you anywhere.