Senior Post Office staff and employees from Fujitsu and ICL were aware or should have been aware of defects in the Horizon system. This system, implemented in 1999, contributed to one of the worst miscarriages of justice in the UK history, with around 736 subpostmasters wrongfully prosecuted between 1999 and 2015 for fraud due to system errors. A statutory inquiry was launched in 2021, and the first volume of its report highlights the human cost and calls for redress. The report confirms awareness of errors among various employees while maintaining a facade of data accuracy.
A number of senior, and not so senior, employees of the Post Office knew or, at the very least, should have known that Legacy Horizon was capable of error.
The Post Office maintained the fiction that its data was always accurate throughout the lifetime of Legacy Horizon.
Horizon Online was also, from time to time, afflicted by bugs, errors, and defects which had the effect of showing gains and losses in branch and Crown Office accounts which were illusory.
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