Post Office lied and threatened BBC over Fujitsu dev whistleblower
Post Office lied and threatened BBC over Fujitsu dev whistleblower

Post Office lied and threatened BBC over Horizon whistleblower

Post Office lied and threatened BBC over Fujitsu dev whistleblower
Post Office lied and threatened BBC over Horizon whistleblower
The fact that there was invisibilised third party access to the accounts used as the basis for prosecutions is important in and of itself. But I'm not seeing much about the underlying reasons for it.
Fujitsu knew that Horizon didn't work properly before it was rolled out to the Post Office. They were told by their own engineers that parts of it had to be rewitten because they were so shoddy. They chose, instead, to have a team of people correcting errors in the background, without disclosing this to subpostmasters or, apparently, the Post Office.
The concern is not that Fujitsu's trouble-shooters might be deliberately falsifying accounts, there is no obvious motive for them to do so. But it does make it clear that the ramshackle system did not work properly, that Fujitsu knew that it did not work properly, and that the only errors which could be corrected were the ones that got picked up centrally, with the process for correcting them creating the potential for more human error.
Fujitsu bosses knew about Post Office Horizon IT flaws, says insider
There's an interesting report on the Justice for Subpostmasters Alliance site also: Origins of a disaster (and long form version).
Many extremely well-paid heads need to roll.
The amount of smoke and mirrors in this project is insane, and there is probably more that was yet to come out of the woodwork.
I doubt any of the decision makes will face really consequences though, those are only for the little people.