(Sorry, I had to edit the text and repost it because the system wouldn't let me after 30mins)
Yes, I've gathered evidence through RTI. I don't take actions based on feelings or emotions, I don't take court actions unless there is solid evidence and unless I am confident to win. My previous experience with government departments is that they never admit wrong-doings until they are taken to the court. A Letter of Demand won't do a thing other than lawyers get paid. Unlike pre-court mediation, it is not compulsary. I understand it's optional.
I know someone who sought second opinion from another lawyer who used a prominent barrister and settled the case during the mediation process at the court with the compentation which was 10 times higher than the first lawyer (who recommended he accept whatever the defendant offered - avoid going to the court).
I know my first, and the most important step, is to find an experienced lawyer/barrister in this area. But I don't know how to find them. I need a list of the names, do some research, and decide who I should hire.