Prison Service Orders (PSOs) are long-term mandatory instructions for prisons in England and Wales. Since 2010, new operational policy has been issued as Prison Service Instructions (PSIs) instead, and since 2019 as Policy Frameworks – but PSOs remain in force until they are formally cancelled.
This list has been refreshed and now shows only the PSOs that HM Prison and Probation Service still lists as current on its official guidance pages. PSOs that have since been cancelled, replaced or made obsolete have been removed. Each entry links directly to the official document (either on GOV.UK or via the UK Government Web Archive), and shows a short description of what it covers.
Source: HMPPS – Prison Service Orders (PSOs) on GOV.UK. If a PSO you are looking for is not listed here, it may have been cancelled – the full PSO index shows the status of every PSO ever issued.