Most people watching this will know the main events of the Prince's relationships, the interview and it's consequences. The film itself focuses on what we don't know: the build up and what was going on in the BBC at the time. Piper, Anderson, Hawes and Sewell are good actors, playing their roles to perfection. The writers create what drama they can from events the viewer knows. I understood more about why the interview happened, and why it was so successful (from an interviewer perspective). There is not much on the victims, but that's not the point. It was the sense of invulnerability that was cracked, not the crimes revealed.
