Source · IMB Annual Report

Grendon

Year: 2024 Published: 22 May 2025 Type: Prison · Cat Category B, Therapeutic Community Population: 160 Recommendations: 3 Key concerns Positive findings

Grendon is a Category B therapeutic community prison with an operational capacity of 185, holding around 160 men. The Board commends the safe environment and therapeutic work but highlights significant concerns regarding the inability to transfer "out of therapy" (OOT) prisoners due to wider prison overcrowding, which negatively impacts the regime and available spaces for new therapy participants. Persistent issues with poor building infrastructure, sanitation, and rat infestation also remain.

Safety statistics

Incidents during reporting year
IndicatorThis yearPrevious
Deaths in custody1
ACCT cases opened3934
Use of force7
Drug finds120377

Positive findings

HMP Grendon is commended as a relatively safe environment with good staff-prisoner relationships and a strong focus on therapy for prisoners with personality disorders. Positive health education events, healthcare champions, and family days are greatly valued. Improvements in neurodiversity support, healthcare planning, and access to GP appointments were noted. The library and creative arts programmes are popular and well-utilized, supporting literacy and wellbeing.

Key concerns

3 items
Overcrowding Repeated The Board continues to be concerned about how men who are out of therapy cannot move on to another prison due to overcrowding, which can have a major impact on the effective running of a therapeutic community.
Resettlement/Release Repeated There continues to be an ongoing issue regarding men who remain too long at Grendon following the completion of their therapy, due to the lack of space at other prisons. There are very few opportunities at Grendon for these men to build on their experiences once they are OOT.
Estate/Conditions Repeated There are still issues with the building infrastructure and associated poor sanitation arrangements in the non-refurbished wings, along with continued rat infestation and the over-heating that is experienced by staff and prisoners during the year.

Recommendations

3 items · 3 repeated
#RecommendationAddresseeStatus
1 The Board continues to be concerned about how men who are out of therapy cannot move on to another prison due to overcrowding, which can have a major impact on the effective running of a therapeutic community. How are specialist prisons, such as Grendon, factored into considerations on prison sentencing policies? Repeated
Response
I have read your report with care and recognise that you have once again raised concerns regarding delays in transferring men from Grendon after completing therapy, which as you rightly highlight can impact the operation of the therapeutic community. The challenges of managing the national prison population continue to affect the ability to progress men in a timely manner. In May 2024, a dedicated Functional Head for Offender Management and Population Management was introduced at the establishment to address these issues directly. I understand that this has supported a notable increase in progression with a 37% rise in transfers out of Grendon over the last year from 60 in 2023–2024 to 82 in 2024–2025. Transfers to open conditions also increased from 8 to 15 in the same period. You will be aware that this Government has also taken a number of steps to try to alleviate the capacity challenges that it inherited. Most recently, the Independent Sentencing Review published its findings in May this year, setting out proposals to address prison and probation challenges and support victims so we can ensure long-term, sustainable improvements. The Government accepts most of the recommendations in the review and will be taking the necessary actions to implement these through legislative changes.
Ministry of Justice In progress
2 There continues to be an ongoing issue regarding men who remain too long at Grendon following the completion of their therapy, due to the lack of space at other prisons. There are very few opportunities at Grendon for these men to build on their experiences once they are OOT. What is being considered to address this matter? Repeated
Response
I have read your report with care and recognise that you have once again raised concerns regarding delays in transferring men from Grendon after completing therapy, which as you rightly highlight can impact the operation of the therapeutic community. The challenges of managing the national prison population continue to affect the ability to progress men in a timely manner. In May 2024, a dedicated Functional Head for Offender Management and Population Management was introduced at the establishment to address these issues directly. I understand that this has supported a notable increase in progression with a 37% rise in transfers out of Grendon over the last year from 60 in 2023–2024 to 82 in 2024–2025. Transfers to open conditions also increased from 8 to 15 in the same period. Your report highlighted the lack of purposeful activity for those men who have completed therapy but remain at Grendon while awaiting transfer and steps have been taken at the establishment to mitigate this. A dedicated workshop and gardens work party now operate in the mornings for this cohort, alongside continued access to work in the main kitchen and an additional gym session. A sustainability work party is also operating in the afternoons, developing green space at the rear of the prison. Men out of therapy are encouraged to take up off-wing jobs and are actively participating in education and personal development activities, including celebration events, diversity initiatives, and health-related programmes. They are also now eligible to apply for wing-based family days. Participation in weekly community meetings is expected, and the out-of-therapy policy and wing constitutions are being updated to reflect these changes. Events such as cultural cafés, creative writing sessions, and the Grendon debate continue to support a healthy and enriching regime.
HMPPS In progress
3 There are still issues with the building infrastructure and associated poor sanitation arrangements in the non-refurbished wings, along with continued rat infestation and the over-heating that is experienced by staff and prisoners during the year. What longer-term plans does the Governor have to address these issues? Repeated
Response
We note that you have raised concerns for the Governor about ongoing issues with building infrastructure in the non-refurbished wings at HMP Grendon, including poor sanitation arrangements. From a national perspective, we wanted to update that significant progress continues at HMP Grendon on fire safety improvement works and the upgrade of the general alarm system. These works are scheduled for completion by the end of the 2025/2026 financial year and represent a total investment of approximately £25.3 million over the past five years. As part of the fire safety improvement programme, all accommodation blocks are undergoing a full overhaul and recommissioning of the Night-Sanitation system. All wings have now been completed, with the exception of D Wing, which remains on track for completion in October 2025.
Governor / Director In progress

Applications to the IMB

CategoryCurrentPrevious
Accommodation, including laundry, clothing, ablutions 4 5
Canteen, facility list, catalogues 1 2
Discipline, including adjudications, incentives scheme, sanctions 1 1
Equality 0 4
Finance, including pay, private monies, spends 4 0
Food and kitchens 0 0
Health, including physical, mental, social care 5 6
Letters, visits, telephones, public protection, restrictions 3 3
Miscellaneous 1 1
Property during transfer or in another facility 2 3
Property within the establishment 0 0
Purposeful activity, including education, work, training, time out of cell 1 0
Sentence management, including HDC (home detention curfew), ROTL (release on temporary licence), parole, release dates, re-categorisation 1 0
Staff/prisoner concerns, including bullying 1 0
Transfers 1 0

Related inspections & investigations

2 May 2023 HMIP · Unannounced Safety 4 · Respect 4 · Activity 2 · Release 4
29 Jan 2024 PPO fatal incident Kevin Kane · Self-inflicted
21 Dec 2019 PPO fatal incident Individual at Grendon · Self-inflicted
19 Oct 2018 PPO fatal incident Individual at Grendon · Natural causes
8 Feb 2017 PPO fatal incident Individual at Grendon · Natural causes
18 Dec 2015 PPO fatal incident Individual at Grendon · Self-inflicted
4 Apr 2017 PFD Arthur Morley · State Custody related deaths

Other reports for Grendon

2025 Published 20 May 2026 Population 170 · Self-harm 17 · Concerns
2023 Published 22 May 2024 Population 160 · Self-harm 34 · Concerns
2022 Published 12 May 2023 Population 160 · Self-harm 28 · Concerns
2021 Published 26 Apr 2022 Population 161 · Self-harm 38 · Concerns
2020 Published 30 Apr 2021 Population 161 · Self-harm 47 · Concerns

Report details

Establishment
Grendon
Type
Prison · Cat Category B, Therapeutic Community
Report year
2024
Published
22 May 2025
Responsible body
HMP Grendon
Recommendations
3
MoJ rating (2024/25)
3 — Good

Population

Population160
Operational capacity185

Service providers

Audiology
Specsavers
Dental
Time for Teeth
Drug and alcohol recovery team (DART)
Midlands Partnership University NHS Foundation Trust
Education
Milton Keynes College
Escort contractor
Serco
Food
HMPPS
Library
Buckinghamshire Council
Maintenance
Gov Facility Services Limited
Mental health services
Oxford Health NHS Foundation Trust
Optician
The Prison Optician Trust
Pharmacy
Practice Plus Group
Podiatry and physiotherapy
Practice Plus Group MSK, Buckinghamshire
Primary healthcare
Practice Plus Group
Social Care
Buckinghamshire Council

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