Documents Reveal Tony Blair Was Alerted to Potential Flaws in Horizon IT System

Documents reveal that Tony Blair was cautioned about potential issues with the Horizon IT system before its deployment.

Blair, at the time Prime Minister, acknowledged these concerns but proceeded after reassurances, including from Peter Mandelson, his trade and industry secretary.

There were no early indications that the software would mistakenly accuse postal workers of theft, although its reliability was in question.

Lord Mandelson's communication from December 10, 1998, advocated for continuing with Horizon, highlighting the risk of political repercussions from post office closures and potential damage to UK-Fujitsu relations. Despite previously being presented to the inquiry, these letters are now fully public.

Initially designed by ICL (a Fujitsu subsidiary) for welfare benefit transactions at Post Offices, Horizon's role shifted to accounting tasks in its 1999 debut.

Over 900 employees were wrongfully prosecuted due to software errors. Under John Major's government, the project lagged over two years behind schedule by 1998, with Blair left to decide its fate.

A Downing Street adviser, Geoff Mulgan, labeled the Horizon system as problematic and costly. Blair sought clarity on the system's reliability. Former Labour ministers, including Alistair Darling and Stephen Byers, discussed rescue options for the floundering project.

In 2022, Blair pointed to Mandelson's reassurances about the software's robustness and viability. None of the former ministers knew of the software errors leading to the false accusations.

Concerns were raised about the system being crucial for maintaining post office traffic. Mandelson cautioned that canceling Horizon would provoke political backlash. His office was contacted for a statement.

Blair's spokesperson affirmed his serious approach to the system's viability and expressed deep sympathy for those impacted by the software's grave flaws.