Opened in 1960 as a borstal, Guys Marsh became a young offender institution in 1984. In 1992, it became a closed establishment and started to accommodate adults becoming an adult male category C in 2008 prison holding prisoners serving life sentences and indeterminate sentences for public protection, as well as those involved in the integrated drug treatment service (IDTS). Guys Marsh was a designated foreign national prisoner centre and a priority prolific offender centre of excellence. The prison is run by HMPS as part of the South West region and has a capacity of 491. The #1 governor is called Ian Walters, who has been in post since August 2019
Accommodation
- Anglia wing – Induction unit
- Mercia wing– General population
- Jubilee wing – Enhanced prisoner unit
- Saxon wing – General population
- Gwent wing – General population
- Cambria wing – Moving towards substance misuse support and interventions
- Dorset wing – General population
- Rainbow – Temporary accommodation
- Fontmell wing – Decanted in June 2022, with plans to demolish