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Between 2000 and 2014, the Post Office prosecuted 736 sub-postmasters and sub-postmistresses based on information from a recently installed computer system called Horizon.

Some went to prison following convictions for false accounting and theft, many were financially ruined and have described being shunned by their communities. Some have since died. After 20 years, campaigners won a legal battle to have their cases reconsidered, after claiming that the computer system was flawed.

One of the people affected by the "horizon" scandal is Chris Trousdale - His post office in Yorkshire had been owned by his grandparents before he took over. He was just 19 when he was convicted for accounting irregularities at his post office in the Yorkshire in 2002. Just over three years ago, he was the first former sub-postmaster to have his conviction overturned.