The system was built & run by Fujitsu.
It was not goods that "disappeared" but phantom money.
Post Offices used to receive mountains of cash daily to pay Pensions, family allowance etc etc
e.g
Postmaster receives £20K - enters £20K in cash received - computer hangs and does not show the receipt of £20K so he hits submit again. This time it shows up & he is happy.
What he did not see was that 2 x£20K showed on the Horizon system as being received.
Other failures were back doors - Fujitsu staff with logons could enter the live system and make/delete entries. This should have been banned but they would try things live rather than test systems.
Post Office chased the "debts" Civil courts prosecuted by Post Office lawyers jailed something near 500 people, peple lost their homes, jobs, wives/husbands and did years inside. Fujitsu said the system did not lie, PO prosecutors did not even question why 10% of their sub posties were dishonest.
Cover-up and more prosecutions when the PO Board & CEO knew there were holes and innocent people lost everything.
This has legs and Fujitsu & PO Senior staff could be jailed for knowing the flaws and perjuring themselves as the gave evidence knowing it to be false.
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