How many people did DS Derek Ridgewell fit up? The sheer scale of his depravity, and his targeting of men of colour, is only now becoming clear

This is not simply a story about a horrifying miscarriage of justice. It is also a story about one of the most corrupt officers in British history and the police establishment that allowed him to thrive in his criminality and then protected him. It is about a justice system so indifferent to the fates of the men wrongfully convicted that it did nothing to clear their names for almost 47 years.