The long-running investigation will enter a new phase this week with findings from a revealing survey of current operators

To date, the public inquiry into the Post Office Horizon IT scandal has heard or received written testimony from more than 500 witnesses over 152 days of hearings, amassing a vast paper mountain of evidence.

What has been exposed has been a litany of cover-ups and poor management, as well as an at-best dysfunctional relationship with supervising government ministers stretching over decades. This is in addition to the many harrowing stories from post office operators the panel has heard.