| HM Prison Establishment |
| Dartmoor (headquarters) |
| Altcourse |
| Ashwell |
| Askham Grange (women) |
| Belmarsh |
| Blundestone |
| Blakenhurst |
| Blantyre House |
| Brockhill |
| Bristol Bronzefield |
| Bullwood Hall (women) |
| Camp Hill |
| Cardiff |
| Castington |
| Chelmsford |
| Coldingley |
| Dorchester Dovegate |
| Durham East Sutton Park |
| Erlestoke |
| Everthorpe |
| Exeter |
| Featherstone Forest Bank |
| Foston Hall |
| Garth |
| Gartree |
| Glen Parva |
| Grendon |
| Guys Marsh |
| Haverrig |
| High Down Huntercombe |
| Lancaster Castle |
| Lancaster Farm |
| Leicester |
| Lincoln |
| Lindholme |
| Low Newton Manchester Military Correction and Training Cemtre |
| Moorland |
| Mount |
| New Hall (women) |
| North Sea Camp Norwich |
| Onley |
| Parc Peterborough |
| Portland |
| Prescoed |
| Preston Risley |
| Rochester |
| Rye Hill |
| Spring Hill |
| Stafford |
| Stocken |
| Stoke Heath |
| Styal (women) |
| Sudbury |
| Thorn Cross |
| Verne |
| Wealstun |
| Winchester |
| Wolds |