I understand the government would have difficulty excluding Fujitsu under its own procurement regulations at the time (Public Contracts Regulations 2015). Fujitsu voluntarily withdrew its bids in 2024. The goverment passed the Procurement Act 2023 which came into force in February 2025 and there is now a national debarment list, though I note Fujitsu isn't on it.

Also, it's important to note that Fujitsu didn't prosecute anyone, they just lied to the Post Office, lied to subpostmasters, remotely altered evidence, gave false testimony in court, etc. It was the Post Office itself that prosecuted its own subpostmasters.