Post Office admits computer defect after prosecutions
8 July 2013 Last updated at 23:15 BST
The Post Office has admitted that software defects have occurred with a computer system at the centre of a bitter dispute with some of its 11,500 sub-postmasters across the UK.
More than 100 say they were wrongly prosecuted or made to repay money after computers made non-existent shortfalls. Some of them lost their homes as a result and a few went to prison.
The BBC's Matt Prodger reports.