https://www.computerweekly.com/feature/Post-Office-Horizon-s...
“The Post Office was determined to keep a lid on the Horizon problems. To do this, it instructed staff in its call centre, which was the first contact point for subpostmasters having problems, to tell callers they were the only ones experiencing problems.
It went further than this by using its legal teams and deep pockets to defend itself against accusations, in court if necessary. It bragged about stopping subpostmasters from “jumping on the Horizon bashing bandwagon” when it silenced them. It also lied to journalists, politicians and anybody else who questioned the robustness of the Horizon system.”