Mark and Nazir start this week's episode with an update on the investigation in to the shooting of nine-year-old Olivia Pratt-Korbel in Merseyside and then continue with the scheduled topic of racism in the criminal justice system.

They discuss implicit race bias and institutionalised racism in policing and in the justice system, giving examples of where they and others have witnessed this first-hand.

Nazir's new book, "The Race to the Top: Structural Racism and How to Fight It", is out now. He knows what it’s like to break the glass ceiling, challenge prejudice and shake up predominantly white institutions. Born in Birmingham to first generation Pakistani immigrants, he was the first Muslim to be appointed as a Chief Crown Prosecutor and the most senior Muslim lawyer in the Crown Prosecution Service.