| Historic rank insignia in use until 1987 | ||||||
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| Rank | Prison Officer | Senior Prison Officer | Principal Prison Officer | Assistant Chief Officer | Chief Officer (Grade II) |
Senior Chief Officer (Grade I) |
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| Rank insignia from the "A Fresh Start" initiative, 1987–2000 | ||||||
| Rank | Prison Officer | Senior Officer | Principal Officer | |||
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The Chief Officer grades were abolished and replaced with junior Governor grades. | ||
| Revised rank insignia with LIDS code and unique identification numbers, 2000–2013 | ||||||
| Rank | Operational Support Grade (OSG) | Prison Officer | Senior Officer | Principal Officer | (Specialist Officer) | |
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Additionally authorised letters could be used to indicate specialist functions: DH – dog handler W – works officer H – healthcare officer | |
| Current rank insignia introduced from April 2013 | ||||||
| Rank | Operational Support Grade (OSG) | Prison Officer | Supervising Officer | Custodial Manager | (Specialist Officer) | |
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Specialist Officers have role identification letters on their epaulettes: DH – dog handler W – works officer H – healthcare officer | |
