‘My anger became fuel’: Jo Hamilton on two-decade long fight against the Post Office

The former sub-postmistress shares her story of resilience, survival and the collective fight for justice

Jo Hamilton, former sub-postmistress at the heart of the British Post Office Scandal, closed XChange UK 2026 with how she used her anger as fuel in the 20-year legal battle that exposed one of the UK’s most significant miscarriages of justice.

Her ordeal began in 2001 when she and her husband bought a village shop with a post office.

Two years later, the installation of Fujitsu’s Horizon accounting system marked the beginning of what would become a long and complex dispute with the Post Office.

“When the system arrived, I thought it would make life easier,” she told the XChange UK audience.

“Instead, I became liable for every shortfall the machine produced.”

Hamilton explained she repeatedly reported discrepancies but was told by the Post Office that she was the only person experiencing problems and that the issue must be her fault.

The shortfalls eventually reached £36k, leading to criminal charges.

After being accused of theft, she ultimately pleaded guilty to false accounting in 2007, a decision she said was driven by pressure and fear of imprisonment.

The power of community

One of the most striking moments in Hamilton’s story came during her court appearance.

Expecting to face the hearing alone, she instead found members of her village attending in support, including the local vicar.

“I didn’t expect them to come.

“But they stood up in court and asked the judge not to send me to prison. That support saved me.”

The judge ultimately sentenced her to probation rather than prison.

But despite avoiding jail, the conviction had a lasting impact.

Hamilton said it destroyed her reputation and made it difficult to find work, forcing her to take cleaning jobs while continuing to fight to clear her name.

A turning point came when Hamilton realised she was not the only sub-postmaster affected.

After her case appeared in the national press, other victims began contacting her and campaigner Alan Bates.

This eventually led to the formation of the Justice for Subpostmasters Alliance (JSA).

“When we first met, we saw what had happened to people - bankruptcies, suicides, lives destroyed,” she noted.

“That anger became fuel. They couldn’t be allowed to get away with it.”

Years of campaigning and legal challenges ultimately resulted in multiple High Court rulings that exposed flaws in the Horizon system and led to the overturning of numerous convictions, including Hamilton’s in 2021.

The power of speaking up

Hamilton also highlighted the role of whistleblowers and journalists in bringing the case into the public spotlight.

She told the audience that without individuals inside organisations speaking up, the legal battle may never have progressed as far as it did.

“If something’s wrong, it’s wrong.

“You have a duty to everyone else to speak up.”

She added that public awareness increased significantly after a television drama released in 2024 reignited attention on the scandal, encouraging more victims to come forward.

A warning about technology and accountability

Hamilton urged the audience not to place blind trust in technology, noting that systems can fail and organisations can overlook warning signs.

“Before this happened, if a system told me something was wrong, I assumed it must be my mistake,” explained Hamilton.

“Now I’d always question it.”

She also warned that legal frameworks often struggle to keep pace with technological developments, which can make it harder to challenge faulty systems.

Closing the session, Hamilton encouraged technology leaders to remain vigilant about the systems they build, deploy and rely on.

Her message to the audience focused on the importance of accountability and collective action.

“If something isn’t right, speak up.

“It might feel impossible to challenge a large organisation, but the power of the collective can make a difference.”

For a room of tech leaders, Hamilton’s story served as a reminder that behind system failures are real people and that transparency and responsibility are critical when technology goes wrong.

Missed out on XChange UK?

You can still register to attend XChange EMEA, taking place on 22-23 June in The Netherlands.

Click here to visit the website and here to secure your free place.

We’ve got more great content coming.