Author Jake Arnott traces the history of corruption in the Metropolitan police.
Are police doing enough to tackle corruption in their ranks? Allan Urry investigates.
David Baker asks what happens to the families of people shot by the police.
Questions remain about alleged police misconduct in a 15-year-old murder investigation.
Are the police really open to scrutiny when people complain about misconduct?
How did police investigations into VIP sex abuse go astray?