Private Eye has a special report (free PDF) on the U.K. Post Office IT scandal that resulted in the wrongful convictions of hundreds of sub-postmasters accused of stealing money.
What actually transpired was that bugs in the outsourced IT system resulted in money appearing as if it was missing. A huge, if not one of the biggest miscarriages of justice in recent U.K. history
How the Post Office wrecked the lives of its own workers.
https://www.private-eye.co.uk/special-reports/justice-lost-in-the-post

Special Report: Justice Lost In The Post
CONCEIVED in 1996 as one of the first private finance initiative (PFI) contracts, between the Post Office and the Benefits Agency on the one hand and computer company ICL on the other, the Horizon IT system had an unpromising start. It had been set up to create a swipe card system for payment of pensions and benefits from Post Office branch counters. But, as with most mega-IT projects of the time, it soon fell victim to over-ambition, management consultancy snake oil and the inability of a PFI contract to deliver a complex public service.