Category B and High Security prisons
Closed prisons holding men with longer sentences and higher security needs, including the high security dispersal estate.
- Top quarter
- Upper middle
- Lower middle
- Bottom quarter
| Prison | Band | Likely position (of 14) | Pillars | Official HMPPS rating | Operator | HMIP inspected | Higher or lower than expected |
|---|---|---|---|---|---|---|---|
| Grendon | Top quarter | 1st–1st | Outstanding · 92% | Public | May 2023 | combined reporting unit | |
| Frankland | Top quarter | 2nd–5th | Good · 75% | Public | Mar 2024 | – | |
| Gartree | Top quarter | 2nd–6th | Good · 62% | Public | Jan 2023 | – | |
| Full Sutton | Upper middle | 3rd–6th | Good · 72% | Public | Mar 2024 | – | |
| Dovegate | Top quarter | 2nd–8th | Good · 61% | Contracted | Sep 2023 | reoffending higher than expected | |
| Whitemoor | Upper middle | 2nd–7th | Good · 65% | Public | Oct 2025 | – | |
| Long Lartin | Lower middle | 5th–12th | Good · 66% | Public | Feb 2026 | – | |
| Manchester | Lower middle | 3rd–13th | Of concern · 57% | Public | Jan 2026 | – | |
| Wakefield | Upper middle | 7th–12th | Good · 60% | Public | Jun 2025 | – | |
| Garth | Lower middle | 7th–11th | Serious concern · 49% | Public | Jul 2024 | – | |
| Isle of Wight | Lower middle | 8th–13th | Serious concern · 47% | Public | Sep 2022 | – | |
| Lowdham Grange | Bottom quarter | 8th–14th | Serious concern · 48% | Public | Mar 2025 | – | |
| Swaleside | Bottom quarter | 10th–14th | Serious concern · 48% | Public | Dec 2025 | – | |
| Woodhill | Bottom quarter | 11th–14th | Serious concern · 50% | Public | Mar 2026 | – |
Positions in the middle of a group are sensitive to weighting and to chance, so the band is the more reliable guide than the position. The bar shows the likely range (5th to 95th percentile over 1,000 re-weightings and measurement uncertainty) and the tick marks the median. The four squares show the pillars in order: Safety, Decency, Regime, Resettlement.
The official HMPPS rating is shown for context. It is not an input to these bands. HMIP inspection dates differ between prisons: a grade can be several years old. A flag is a prompt to look, not a finding of fault. Read the methodology.