I've just been for a longish walk and have been listening to more episodes of the BBC Sounds podcast by Nick Wallis. It just gets worse, the more you hear. The sub-postmasters took the PO to the Commercial Court in 2013. They had to raise a lot of money to do that but the Post Office tried to make things as difficult as possible as they could easily outspend them. In fact the Chief Financial Officer at the PO allegedly told a union official that this was their strategy.
There were about 5 cases in all, as there was too much for one single case. Alan Bates was the first to go, and he won pretty comprehensively. The second case was about the reliability of the system and the PO got shredded in that one. That revealed the infamous Clark Memo, which was prepared by a QC and said that the Horizon system was flawed and that convictions based on it were inherently unsafe. The PO never disclosed that externally (although from a purely technical legal point of view they didn't have to) but they didn't even share it with their own General Counsel or board.
They then held a series of internal meetings reviewing the cases they'd prosecuted but stopped, with their Head of Securtoy ordering the notes from those meetings to be shredded. An anonymous lawyer (who was clearly close to the proceeding) said that was an egregious case of conspiracy to pervert the course of justice, as the documents were effectively part of the series of cases that were going on back in 2014.
They've known for 10 fucking years that people were wrongly convicted and while some convictions (the 39 that were the subject of the Clark memo) have been overturned, many others haven't and the innocent victims are still waiting for proper compensation. It made me so angry.
Prison isn't adequate punishment for Vennells and the others involved. They should be in front of a firing squad or dangling on the end of a rope.