After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis, gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today, Alan Bates and the sub-postmasters reach the High Court, and the Post Office’s secrets start to tumble out one by one.

Presenter: Nick Wallis

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis, gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today, the sub-postmasters have hit rock bottom. Working with the Post Office has failed and their last hope is a long shot lawsuit. But Nick manages to get hold of some crucial documents and a whistleblower which might make all the difference.

Presenter: Nick Wallis

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis, gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today, the Post Office is standing firm in the face of political pressure, and Nick explores an explosive intervention from an unlikely source - the sub-postmasters' own union.

Presenter: Nick Wallis

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis, gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today, the mediation scheme designed to solve the problem is becoming fraught, so MPs step up the campaign of political pressure on the Post Office. And Lee Castleton, a sub-postmaster from Bridlington, tells his story.

Presenter: Nick Wallis

The extraordinary story of a decade-long battle with the Post Office, fought by their own sub-postmasters. Some call it the widest miscarriage of justice in UK legal history.

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today, the rollercoaster ride contnues as hopes of a settlement turns to despair at an apparent change of legal tactics by the Post Office and campaigners face the prospect of a long and seemingly unwinnable courtroom battle.

Presenter: Nick Wallis

The extraordinary story of a decade-long battle with the Post Office, fought by their own sub-postmasters. Some call it the widest miscarriage of justice in UK legal history.

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today we hear the part a helicopter crash played in the campaign for justice as the sub-postmasters take their case to Westminster.

Presenter: Nick Wallis

The extraordinary story of what some say is the widest miscarriage of justice in UK legal history as sub-postmasters take on the Post Office.

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today we get inside the story of Sarah Burgess-Boyd, who was just one of hundreds of sub-postmasters charged with theft. We hear first-hand her contemporaneous testimony to her accusers. We also learn about the oldest recognised criminal investigations force in the world - the Post Office

Presenter: Nick Wallis

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

In this ten-part series, journalist Nick Wallis, gets right to the heart of the story, as he talks to those whose lives were shattered and follows the twists and turns of a David and Goliath battle as the sub-postmasters tried to fight back.

Today we meet the man who led that fight; the UK's Erin Brokovich, Alan Bates, founder of the Justice For Subpostmasters Alliance. A man who faced seemingly insurmountable odds in trying to take on a national institution but who refused to be cowed.

Presenter: Nick Wallis

After the introduction of a new computer system in the early 2000s, the Post Office began using its data to accuse sub-postmasters of falsifying accounts and stealing money. Many were fired and financially ruined; others were prosecuted and even put behind bars.

But many of the accused insisted that they had done nothing wrong and that they were being held accountable for computer errors they could not control.

After being contacted by a man who insisted that his pregnant wife had been jailed for a crime she didn’t commit, journalist Nick Wallis started investigating what some are already describing as the widest miscarriage of justice in UK legal history.

In this ten-part series, Nick gets right to the heart of the story, as he talks to those whose lives were ruined and follows the twists and turns of a David and Goliath courtroom battle as the sub-postmasters tried to fight back. Could they have been victims of what they saw as institutionalised corporate cruelty from the Post Office?

Presenter: Nick Wallis

The extraordinary story of a decade-long battle with the Post Office, fought by their own Sub Postmasters. Some call it the widest miscarriage of justice in UK legal history.