I don't think the CPS had anything much to do with this - these were private prosecutions by the Post Office themselves. Which also meant that they could get a

I don't think the CPS had anything much to do with this - these were private prosecutions by the Post Office themselves. Which also meant that they could get away with things like requiring people not to criticise the Horizon software in order to avoid going to jail. Also, it's not just that they thought hundreds of people, all of the same rank, all committed fraud despite never working out what actually happened. The larger Post Office branches are directly owned and operated, employing a number of staff. They are equally convinced that none of those staff did the same thing, even though there's apparently a whole bunch of unresolved accounting discrepencies around those branches and their controls seem entirely inadequate. The difference is that sub-postmasters are basically liable by default.