The Government Says

Guidance: Prison health and safety workplace inspection arrangements: PSI 36/2015

Guidance: Prison health and safety workplace inspection arrangements: PSI 36/2015
Local copy of PSI_36_2015_AI_25_2015_HS_Workplace_Inspection.pdf
Local copy of psi-06-2015-pi-03-2015-national-hs-policy-july-2025.pdf

https://www.gov.uk/government/publications/prison-health-and-safety-workplace-inspection-arrangements-psi-362015

seen at 16:49, 13 July in Ministry of Justice - Activity on GOV.UK.