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United Kingdom · London · London

HMP Belmarsh

Category AMaximummaleUnder capacity (88%)ModerateHigh
Verified 29 May 2026 · Data dated 1 Jun 2024
Fresh · 1mo ago

Data is aggregated from public sources and may be incomplete or out of date. Always verify with primary sources before acting on any figure. See data sources.

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Photograph of HMP Belmarsh
Photo via Wikimedia Commons

Gallery

From Wikimedia Commons (CC-BY-SA where not otherwise stated).

  • 2017 Thamesmead aerial view 02 (cropped).jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • 2017 Thamesmead aerial view 02.jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • 2017 Thamesmead aerial view 02a.jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • 2017 Thamesmead aerial view 02b (cropped).jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • 2017 Thamesmead aerial view 02b.jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • 2019 View from Gallions Hill, SE London 12.jpg

    Photo by Kleon3 via Wikimedia Commons (CC BY-SA 4.0)

  • Abolish All Prisons Protest outside Belmarsh Prison.jpg

    Photo by Alisdare Hickson via Wikimedia Commons (CC BY-SA 4.0)

  • End solitary confinement ! (cropped).jpg

    Photo by Alisdare Hickson via Wikimedia Commons (CC BY-SA 2.0)

UK Category A prison operated by HM Prison & Probation Service. Listed in the GOV.UK Find a prison directory.

Background

His Majesty's Prison Belmarsh is a Category A men's prison located in Thamesmead, south-east London, England. Belmarsh Prison is run by His Majesty's Prison Service and is situated next to HMP Isis and HMP Thameside. The prison is used for high-profile prisoners, particularly those concerning national security. Within the grounds of the prison is the High Security Unit (HSU), consisting of 48 single cells. Belmarsh is nicknamed "Hellmarsh", owing to the high number of physical and authority abuses reported by both the prison's inmates (including former politician Jeffrey Archer, who coined the name and was imprisoned there for two years for perjury), and human rights activists.

Source: Wikipedia article lead, CC-BY-SA.

Capacity

910

Current population

800

Occupancy

88%

Year opened

1991

Operational

Facility profile

Operator

HM Prison & Probation Service

Population held

male

Opened

1991

Region

London

Security level

Maximum

Death-row facility

No

Conditions

This review visit followed up on the concerns we raised at our last made the following judgements about outcomes for prisoners. Figure 1: HMP Belmarsh healthy prison outcomes in 2021 and 2024 reasonable outcomes in three of our four healthy prison tests, with the We last inspected Belmarsh in 2021 when we highlighted deficiencies in safety outcomes for prisoners and assessed the provision of purposeful activity as poor, a longstanding and repeated criticism we have made about the prison. Outcomes in our healthy prison tests of respect and rehabilitation and release reasonable outcomes in three of our four tests. Our principal concern, however, remains the quality of regime where outcomes were again poor.

Visiting

This review visit followed up on the concerns we raised at our last we visited them. Our colleagues in Ofsted judged the overall effectiveness of

Mailing

Underpinning all of these assessments was our view that the delivery of a

Practical info

Note: rehabilitation and release planning became ‘preparation for release’ in October 2023. outcomes for prisoners and assessed the provision of purposeful activity as Outcomes in our healthy prison tests of respect and rehabilitation and release remains the quality of regime where outcomes were again poor. Frustratingly, there were enough purposeful activity spaces to provide at least aware of this problem. A new daily regime had been introduced, in part aimed at improving time out of cell and ensuring more time was available in the open air.

Known issues

Belmarsh. Recorded violence was little changed and was typical of comparable there was improvement to be made in the management of segregation, but were proportionate for a high security prison, although a mandatory drug test figure of 26% was concerning. Self-harm incidents were lower than at Although the prison felt generally well-ordered and calm, rates of violence had violence and use of force, it was not being used to support the development of an effective strategy for reducing violence. It was concerning that there had been no violence reduction meeting for more than a year.

Notable inmates

  • Julian Assange
    Julian Assange
    1971 · Internet activist

    Julian Paul Assange ( ə-SAHNZH; né Hawkins; born 3 July 1971) is an Australian editor, programmer, and publisher who founded WikiLeaks in 2006.

  • Jonathan Aitken
    1942 · politician

    Jonathan William Patrick Aitken (born 30 August 1942) is a British author, Church of England priest and former Conservative Party politician.

  • Anjem Choudary
    Anjem Choudary
    1967 · religious figure

    Anjem Choudary (born 18 January 1967), also known as Abu Luqman, is a British Islamist who has been described as "the face" of militant Islamism or the "best known" Islamic extremist in Britain.

  • Denis MacShane
    Denis MacShane
    1948 · politician

    Denis MacShane (born Josef Denis Matyjaszek; 21 May 1948) is a British former politician, author, commentator and convicted criminal who served as Minister of State for Europe from 2002 to 2005.

  • Abu Hamza al-Masri
    Abu Hamza al-Masri
    1958 · civil engineer
  • Andy Coulson
    1968 · journalist

    Andrew Edward Coulson (born 21 January 1968) is an English journalist and political strategist. Coulson was the editor of the News of the World from 2003 to 2007, following the conviction of one of the newspaper's reporters in relation to illegal phone-hacking.

  • Richard Tomlinson
    1963 · intelligence officer

    Richard John Charles Tomlinson (born 13 January 1963) is a former officer of the British Secret Intelligence Service (MI6).

  • Jeffrey Archer
    Jeffrey Archer
    1940 · politician

    Jeffrey Howard Archer, Baron Archer of Weston-super-Mare (born 15 April 1940) is an English novelist and former politician.

  • Ronnie Biggs
    Ronnie Biggs
    1929–2013 · carpenter

    Ronald Arthur Biggs (8 August 1929 – 18 December 2013) was a British criminal who helped plan and carry out the Great Train Robbery of 1963.

Showing 9 of 12. Source: Wikidata + Wikipedia.

Contact & address

HMP Belmarsh Western Way Thamesmead London SE28 0EB See map, London SE28 0EB

Conditions Risk Score

Derived signal — not a judgement. How it's calculated

25/100
Moderate concern25/100
Overcrowding
0/30
Oversight reports
15/30
Structural flags
5/15
Death signals
5/15
Conditions text
0/10

What the score is responding to:

  • · 5 oversight reports in the last 5 years
  • · Substantial documented known-issues record
  • · In-custody-death signal in sources

Trend over time

Population and occupancy by year. Source: official corrections statistics + oversight reports.

Population held

2020: 780+2.6%2024: 800

Occupancy %

2020: 86.0%+2.3%2024: 88.0%

Compared to other facilities in United Kingdom

583 peers
Conditions risk scorethis: 7/100 · peers avg: 4/100 (+81%)

Higher risk than 80% of peer facilities in United Kingdom.

Occupancythis: 88% · peers avg: 115% (24%)
Capacity (beds)this: 910 · peers avg: 595 (+53%)

Reports

  • HMIP7 Apr 2025

    1.1 HMP Belmarsh is a high-security prison in south-east London. It is one of 13 long-term and high security prisons, but is the only reception prison in the high security estate. It also operates a high secure unit (HSU) for prisoners presenting the very highest risk of escape. 1.2 This review visit followed up on the concerns we raised at our last inspection of HMP Belmarsh in 2024. What we found at our last inspection 1.3 At our previous inspections of HMP Belmarsh in 2021 and 2024, we made the following judgements about outcomes for prisoners. Figure 1: HMP Belmarsh healthy prison outcomes in 2021 and 2024 Note: rehabilitation and release planning became ‘preparation for release’ in October 2023. 1.4 At the last full inspection in June 2024, Belmarsh was delivering reasonable outcomes in three of our four healthy prison tests, with the

    source

  • HMIP3 Jun 2024

    Located in south-east London and opened in the early 1990s, Belmarsh is one of the most important prisons in the country. As well as a reception prison where most men are on remand or unsentenced, it is also the high security prison for the capital and much of southern England. At the time of our inspection 717 men were being held. This included 98 who were category A, 12 of whom were housed in the prison’s high security unit, effectively a prison within the prison. We last inspected Belmarsh in 2021 when we highlighted deficiencies in safety outcomes for prisoners and assessed the provision of purposeful activity as poor, a longstanding and repeated criticism we have made about the prison. Outcomes in our healthy prison tests of respect and rehabilitation and release planning were, in contrast, reasonably good. At this inspection it is pleasing to report that we found a safer prison and that Belmarsh is now delivering reasonable outcomes in three of our four tests. Our principal concern, however, remains the quality of regime where outcomes were again poor. Frustratingly, there were enough purposeful activity spaces to provide at least part-time employment for all prisoners, but in the sample we reviewed only 22% were allocated and for those that were, attendance was poor. Leaders were aware of this problem. A new daily regime had been introduced, in part aimed at improving time out of cell and ensuring more time was available in the open air. However, these arrangements were not yet working. We found a third of prisoners locked up during working hours and some prisoners had as little as 90 minutes a day out of cell. Our time-out-of-cell checks showed only 28% of prisoners were engaged in purposeful activity, with many facilities empty when we visited them. Our colleagues in Ofsted judged the overall effectiveness of education, work and skills provision at Belmarsh to be inadequate, their lowest assessment. Other challenges included the significant increase in the turnover of prisoners since we last inspected, many of whom were unconvicted. Reception and induction arrangements were adequate but could have been much better. Other measures of safety reflected the risks and challenges inherent in a prison like Belmarsh. Recorded violence was little changed and was typical of comparable prisons, but arrangements to promote positive behaviour were robust with, for example, a focus on tackling gang affiliations. Use of force had increased and there was improvement to be made in the management of segregation, but overall oversight and governance of both was sufficient. Security arrangements were proportionate for a high security prison, although a mandatory drug test figure of 26% was concerning. Self-harm incidents were lower than at comparable jails, although again there were some obvious shortcomings, improvements to which would almost immediately improve outcomes. Underpinning all of these assessments was our view that the delivery of a reliable regime of activities would lead to improved outcomes in what was already a generally competent prison. About two-thirds of prisoners told us they felt respected by staff, and while our observations were also positive, the staff culture was best characterised as confident, capable and business-like rather than warm. The staff compliment was diverse which mirrored the prisoner population. Overall, the promotion of fair treatment was good and consultation acceptable, although systems for redress were weaker. The prison was not overcrowded and the environment was reasonable, although the outside grounds had deteriorated. Belmarsh was well led, and better than many other reception prisons. Leaders were visible and capable and the confidence they instilled was evident in the performance of staff. There were clear parameters and boundaries, and a strong sense that staff were in charge. The competence we saw was reassuring

    source

  • HMI Prisons inspection report15 Aug 2023

    Found significant lockdowns, restricted regimes for many inmates, and limited purposeful activity. Healthcare provision rated 'reasonably good'.

    source

  • HMIP11 Apr 2022

    1.1 HMP Belmarsh is a high-security prison in south-east London that held approximately 660 prisoners at the time of our inspection, most of whom were unsentenced. It is one of 13 long term and high security prisons, but the only reception prison in the high security estate. It also operates a high secure unit (HSU) for prisoners presenting the very highest risk of escape. 1.2 At our previous inspections of HMP Belmarsh in 2018 and 2021, we made the following judgements about outcomes for prisoners. Figure 1: HMP Belmarsh healthy prison outcomes in 2018 and 2021 Good Reasonably good Not sufficiently good Poor

    source

  • HMIP2 Aug 2021

    Belmarsh is a high-security, men’s prison in south-east London that held 675 men at the time of our inspection, of whom nearly 60% were unsentenced and 17% were category A prisoners. Within the jail there is also high secure unit. The prison services the London courts, particularly Woolwich and the Old Bailey, but because of reduced courtroom space created by COVID-19 restrictions, prisoners had been attending courts further afield. This had led to a strain on resources in the prison because more staff were required for escort duty. While maintaining a strong security focus, the governor had set out to improve relationships between officers and prisoners and to create a more representative and caring staff team. Although this change was not manifested in our survey results, inspectors commented on the many positive interactions they saw in the jail and prisoners often told us about supportive staff members. Leaders recognised there was further work to be done to improve the culture in the prison: for example, many staff routinely failed to collect or turn on body- worn cameras and we saw officers who were supposed to be supervising the most vulnerable prisoners, sitting reading the paper. Although the prison felt generally well-ordered and calm, rates of violence had risen since our last inspection despite COVID-19 restrictions limiting the time most prisoners were out of their cells. While the prison collected data on violence and use of force, it was not being used to support the development of an effective strategy for reducing violence. It was concerning that there had been no violence reduction meeting for more than a year. The underuse of data was something of a theme of this inspection – leaders did not have an adequate plan to consider outcomes for different groups such as the disproportionate use of force on black and younger prisoners, and neither data nor consultation were used to understand and address these or other disparities. While the prison’s self-assessment report (SAR) suggested violence had reduced because there were fewer incidents, in reality, with fewer prisoners in the jail, rates were actually increasing. The prison had not paid sufficient attention to the growing levels of self-harm and there was not enough oversight or care taken of prisoners at risk of suicide. Urgent action needed to be taken in this area to make sure that these prisoners were kept safe. The 52% of prisoners who were not working were spending 23 hours a day locked in their cells while the education block, gym and library had sat empty and unused for more than a year. The provider was finally running some face- to-face education on the wing, though access was limited, and some prisoners were getting taught through their cell doors during the lunchtime lockdown. In- cell work packs were being offered to prisoners, but engagement had been low and prisoners in the high secure unit received no regular education. Two men who had volunteered to be reading mentors had received no training, materials or support. The governor had a strong vision for the future of the prison, but for this to be realised she will need to strengthen her senior team and make sure that there is more rigorous oversight of some of the key areas – such as care for the most vulnerable prisoners, effective safety strategies and a better understanding of disparities between different groups – and use data to understand the challenges, set targets and measure progress. Charlie Taylor HM Chief Inspector of Prisons September 2021

    source

Data completeness

100%

How many of our profile fields are populated. We surface this so families and researchers know the limits.