This story has finally been getting the air it deserves.
If you want a summary and insight into the staggering scale of the injustice, this article from Private Eye magazine is worth reading:
https://www.private-eye.co.uk/pictures/special_reports/justi...
This BBC radio programme, started in 2020, also gives a lot of good information including details of how suspected sub-postmasters were questioned by the Post Office.