I would take them for unfair dismissal at a tribunal, the judges do want to know what led up to the events, I know this as I have just been to tribunal. I won my constructive dismissal case and represented myself. getting all your documents from the under data protection would be the best move but dont let them know why incase some go missing as in my case. What the judges want are facts and especially where evidence can be provided. In my judgement they stated "the tribunal has rarely seen a case as clear cut for constructive dismissal" i was so badly treated by the managers that it was unbelivable, but they were not so confident when in court giving evidence. Anyway best of luck, remmeber facts that are relivent, and in order no jumping dates when telling your story