Since becoming an MP in November 2012 I had worked hard to understand child sexual exploitation. Before the Jay report came out I had collaborated with Barnardo's to run a cross-party inquiry into the crime and managed to change both the law and practice to try and counter it. Through all this, I thought I was an expert. In reality, I knew nothing! The scale of abuse in my constituency, 1,400 victims over 16 years, totally floored me.