It was reported quite a few times in the BBC, HN, and probably others, in the past couple of years. I think it had plenty of coverage but nobody really cared - it really affected business owners.

The software is dogshit as well as the company, their investigators and Post Office. But I think a lot of people were pressured into plea deal's or something, pressured/forced into repaying money they never stole, which complicated things quite heavily from a top-down analysis of these prosecutions. But the idea some random postmasters would collude in this all over the country is kind of crazy and I'm not sure how post offices are that profitable to begin with for each branch to have £40,000 stolen or whatnot..