One of my aunts was a postmistress for many years and I can remember her saying that the system was difficult to use when it was introduced. Where they had had to rely on their own knowledge and expertise, to balance the books, this system took it over.
What I can't understand is why the Post Office didn't seem to stop and actually wonder just why the books of so many local post offices weren't balancing, they just assumed that the system must have been perfect, so they must have all been on the fiddle beforehand.
I just hope that they are financially recompensed even though nothing can make up the time for those that were imprisoned or those that have since passed away because it took so long.