Former Post Office boss Alan Cook apologises at inquiry

Summary

1. Former Post Office director Alan Cook is appearing at the inquiry into the Horizon IT scandal today
2. Cook was managing director from 2006 to 2010 - hundreds of people were prosecuted while he was in charge
3. Cook has previously said he didn't know about problems with Horizon until shortly before he left his post
4. Adam Crozier, the former CEO of Royal Mail Group Ltd and former director of Royal Mail Holdings plc, will also appear at the inquiry today
5. Crozier has said he had no involvement with the Horizon issue but was "deeply sorry for those whose lives were ruined by what happened"
6. Between 1999 and 2015, more than 900 sub-postmasters were prosecuted due to the faulty system