Sarah Munby's evidence didn't seem that interesting to start with, rather dry, but for me it got more interesting the more it went on.
The enlightening stuff for me related to the abbreviations VFM (Value for Money) and MPM (Managing Public Money) and how these concepts influence decision-making in the Civil Service and the government.
As I interpreted her evidence, the Civil Service wanted to avoid creating a compensation scheme that gave a correct amount of compensation. This was because it would be very complicated because the subpostmasters' (SPMs) cases were very different and often very complicated, which would mean spending resources and money, and the preference was for cheap and cheerful having a blanket approach. But this meant that some SPMs would win, and some would lose. For no one to lose, this would mean that at the higher end there would be big wins. In other words, to constrain costs to some degree, it was necessary that some SPMs would be short-changed. That was in the past, maybe in 2021.
Now things are very different. Munby was asked why but she was clearly evasive. Everyone knows why, it was political pressure as a result of widespread public disgust and outrage. She went round the houses several times to deflect away from the real reason why the "political head of steam" built up. A programme on the telly.