#sub-postmasters

The Post Office Horizon Scandal

Between 1999 and 2015, the British Post Office prosecuted more than 900 of its own sub-postmasters — the men and women who ran the country's village shops and high-street branches — for theft, fraud, and false accounting, on the strength of figures produced by a single computer system. The system was called Horizon. It had been built by the Japanese technology company Fujitsu, rolled out from 1999 to some 14,000 branches across the United Kingdom, and it produced shortfalls — sums of money the accounts said were missing — that the sub-postmasters could not explain because they had not taken anything. Under the contract every sub-postmaster signed, those shortfalls became personal debts, and the Post Office, which held its own statutory power to prosecute, took hundreds of them to court. Seema Misra, the sub-postmistress of West Byfleet in Surrey, was sentenced to fifteen months in prison on November 11, 2010 — her son's tenth birthday — while eight weeks pregnant. Others were bankrupted, lost their homes, were shunned by the communities they had served, and at least four are believed to have taken their own lives. The Post Office knew, from at least 2010 and arguably earlier, that Horizon contained bugs capable of generating phantom shortfalls, and that Fujitsu's engineers could alter branch accounts remotely without the sub-postmaster's knowledge — and it continued to deny both in court for the better part of a decade. The cover-up unravelled not in a courtroom first but through the persistence of one campaigner, Alan Bates, a journalist's filing cabinet, a High Court judge who refused to be recused, and — finally, in January 2024 — a four-part ITV drama that did in a week what twenty years of litigation had not. In May 2024 Parliament passed an unprecedented law quashing every Horizon-related conviction at a stroke. This article examines what the system did, what the institution knew, and why the answer to the only question that matters — how an organisation can prosecute its own people for its own software's errors, for fifteen years — turns out to be less about a computer than about a contract, a culture, and a refusal to look.