A timeline of the Post Office Horizon scandalpublished at 09:14 British Summer Time 11 April
- 1999: The Horizon accounting system is rolled out in Post Offices across the UK
- 2000: The first issue with the system is reported by Alan Bates, sub-postmaster of a branch in Wales
- 2003: Bates loses his job after refusing to accept responsibility for missing funds in the branch accounts
- 2004: More sub-postmasters find themselves being asked questions about missing funds - at times in the tens of thousands of pounds. Jobs are lost, some are declared bankrupt and some eventually sent to prison
- 2010: A high-profile case of wrongful conviction occurs - pregnant Surrey sub-postmaster Seema Misra is jailed after being accused of stealing £74,000
- 2012: Formal investigations into the Horizon software begin
- 2015: The Post Office halts private prosecutions of sub-postmasters
- 2017: Legal action is launched against the Post Office by a group of 555 sub-postmasters
- 2019: Post Office CEO Paula Vennells stands down, before the company agrees to pay £58m to the 555 sub-postmasters
- 2021: The public inquiry into the scandal begins
- 2023: The government announces that every wrongly convicted sub-postmaster will be offered £600,000 in compensation
- 2024: There's a resurgence of interest in the scandal after ITV releases a mini-series titled Mr Bates vs the Post Office. Vennells hands back her CBE
- 2024: The government introduces new legislation to speed up clearing victims' names and paying compensation