Are there more details on that somewhere? Feels like something that an investigative journalist (or, I guess these days, podcaster) would've dug right into the guts of.
You can read a report at e.g. https://www.private-eye.co.uk/pictures/special_reports/justi...
As well as Wikipedia of course https://en.wikipedia.org/wiki/British_Post_Office_scandal
https://www.bbc.co.uk/programmes/m000jf7j/episodes/downloads
There is also a book by the same reporter.
Hard to read without boiling your blood