Anton Du Beke, Marcus Brigstocke, Sayeeda Warsi, Freddy Forster, Sonali Shah, Jack Stein, Amy De Bhrún

Steph's joined by Anton Du Beke, Marcus Brigstocke, Baroness Warsi and Freddy Forster. Plus: the team investigate the real-life Line of Duty as they meet some former forensic investigators.