The Post Office Horizon Scandal has been called the widest miscarriage of justice in modern British history, with the number of former Sub Postmasters whose convictions have been overturned now over 60. Those who suffered prosecution or financial ruin due to errors on the Post Office's Horizon computer system want answers. How could this have happened? Who is responsible? Continuing the series that has helped expose the scandal since 2020, Nick Wallis draws on interviews, documents and the extraordinary revelations spilling out of the ongoing public inquiry. For the first time, the public is getting real insight into what was really going on inside the Post Office. In Episode 14, we hear how the Post Office disregarded red flags about Horizon when it rolled the system out, and how flawed and incomplete prosecution policies set the stage for the mass prosecution of many innocent Sub Postmasters. Presenter: Nick Wallis Producer: Robert Nicholson Sound Design and Mixing: Arlie Adlington Executive Producer: Will Yates A Whistledown production for BBC Radio 4