How the Post Office’s Horizon system failed: a technical breakdown

From bugs to unqualified staff, the Post Office’s point-of-sale system was inadequate on many levels

The Horizon IT scandal, frequently called the largest miscarriage of justice in British history, is back in the headlines thanks to a prime-time ITV dramatisation. The resulting surge of interest has led to Paula Vennells, who ran the Post Office from 2012 to 2019, agreeing to return her CBE. But there’s also a technical underside to the very human story of power run rampant.