Between 1999 and 2015, hundreds of self-employed sub-postmasters at branches of the state-owned Post Office were convicted of theft, fraud and false accounting because faulty software wrongly showed thousands of pounds missing from branch accounts.
A TV dramatisation of the scandal, one of the biggest miscarriages of British justice, has heaped pressure on the government to act more swiftly to deliver justice, after some sub-postmasters were jailed and hundreds of others saw their livelihoods destroyed.
While 93 convictions have been overturned, hundreds of others are yet to be quashed.
(Reporting by Sachin Ravikumar; editing by William James)