Sorry to hear that. Bullying and slyness by bosses in any sector is disgusting. I hope Mrs.V pursued a case. The events you describe are an archetypal constructive dismissal.
With your inside track, are some heads/governors able to circumvent national pay scales and pay that derisory £28k for 30 years experience? The BBC stated ONS figures that the median pay for a classroom teacher is £39,500. Which accords with the pay level of M6 on the NASUWT website.