United Kingdom · Royal Borough of Greenwich
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His Majestyâs Prison is a Category C male Young Offenders Institution, located in the Thamesmead area of the Royal Borough of Greenwich, in south-east London, England. The Prison is operated by His Majesty's Prison Service, and is situated next to Belmarsh Prison and Thameside Prison.
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Capacity
—
Current population
—
Occupancy
—
Year opened
2010
Operational
Figures from official sources · verified 28 May 2026 · methodology
Operator
His Majesty's Prison ServicePopulation held
Mixed/unknown
Opened
2010
Region
Royal Borough of Greenwich
Security level
—
Death-row facility
No
An experienced and innovative leadership team and an improved staffing With improvements from poor to not sufficiently good in both our purposeful prison that holds a volatile and risky population. The jail retained our top rating of good for respect and a rating of not sufficiently good for safety. restricted regime which fed, rather than addressed, the cycle of violence and always get their entitlements and that the regime was sometimes restricted. Leaders will need to make sure that this does not become a regular occurrence, unable to coexist with men with whom they had conflict.
Visits at HMP/YOI Isis are booked via the GOV.UK Prison Visits Booking service. Photo ID is required for all adult visitors.
postcode-led placement and created a Peace spur for those who wished to
activity and preparation for release tests, we were pleased to see progress in a restricted regime which fed, rather than addressed, the cycle of violence and the prison. These men were rewarded with more time out of cell and more always get their entitlements and that the regime was sometimes restricted. unable to coexist with men with whom they had conflict. While the regime on The result of these changes there was a better regime than we had seen at our last inspection, and the work and training offer had improved.
restricted regime which fed, rather than addressed, the cycle of violence and violence, particularly assaults on staff. By the time of our inspection, these had violence remained too high. A further ‘peace’ wing was due to open shortly after
Derived signal — not a judgement. How it's calculated
What the score is responding to:
This facility scores 18. The national average across 584 scored United Kingdom facilities is 4 — 14 points above national average.
Same country, matched on type + security level where possible.
An experienced and innovative leadership team and an improved staffing situation had led to improvements at this South East London, category C prison that held 577 young men at the time of this inspection. With improvements from poor to not sufficiently good in both our purposeful activity and preparation for release tests, we were pleased to see progress in a prison that holds a volatile and risky population. The jail retained our top rating of good for respect and a rating of not sufficiently good for safety. At our last inspection, men with different London gang affiliations were held on different wings to prevent those in conflict from mixing. This had led to a highly restricted regime which fed, rather than addressed, the cycle of violence and retribution in which so many prisoners were trapped. The courageous governor had decided to introduce the ‘Peace Strategy’ which ended automatic, postcode-led placement and created a Peace spur for those who wished to serve their sentences away from the conflict that had been such a hallmark of the prison. These men were rewarded with more time out of cell and more enrichment activities. Some men on the Peace spur told me that they did not always get their entitlements and that the regime was sometimes restricted. Leaders will need to make sure that this does not become a regular occurrence, otherwise the benefits of behaving well will be undermined. The prison had also created a ‘growth’ spur for those prisoners who were unable to coexist with men with whom they had conflict. While the regime on this spur was very restricted, a well-motivated staff team used interventions that included the support of two older, life-sentenced prisoners from the Men of Purpose initiative to help men to move to a main location. In the months after this change, there had been a big increase in the rate of violence, particularly assaults on staff. By the time of our inspection, these had considerably reduced as prisoners begun to accept the change. Because they were no longer necessarily located with their friends or fellow gang members, a higher than usual proportion of prisoners said they were afraid and rates of violence remained too high. A further ‘peace’ wing was due to open shortly after the inspection as a further incentive to prisoners to behave well. The result of these changes there was a better regime than we had seen at our last inspection, and the work and training offer had improved. It was, however, taking too long to allocate prisoners to activities, too many of which were only part time. This led to many men being locked in their cells for up to 22 hours a day and overall, time out of cell was not nearly good enough. Attendance at education was disappointingly low in a jail where many of the young men had underachieved at school. The use of PAVA incapacitant spray was high and while use was proportionate in most cases, in some footage inspectors viewed, it was clear that staff were using it too readily. The prison was cleaner than at our last inspection, but standards were not good enough and leaders needed to do more to hold staff and cleaners to account for the state on their wings.
1.1 Isis is a category C prison in south-east London. It opened in 2010 and holds about 600 young men. 1.2 At our previous inspections of HMP/YOI Isis in 2018 and 2022, we made the following judgements about outcomes for prisoners. Figure 1: HMP/YOI Isis healthy prison outcomes in 2018 and 2022. Good Reasonably good Not sufficiently good Poor
Isis is a modern, category C prison in south-east London that held 595 young men at the time of our inspection. There was a high turnover of prisoners with an average of 80 arrivals each month, but in spite of this instability, the prison retained a good atmosphere with generally positive relationships between prisoners and staff. This was in part driven by some excellent work on equality and diversity that sought both to understand and respond to the experiences of prisoners, and to use data to make sure that there was fair and proportionate treatment of different groups. The energetic and well-liked governor was behind much of what was effective at Isis; she knew her jail well, had advocated for the prison to return to its original mission of housing young adults, and had personally driven through her priority to improve understanding among staff of the needs of prisoners. In the areas where she had paid most attention, good progress had been made, resulting in our highest score for the healthy prison test of respect. Ongoing improvements to the living conditions were taking place, although parts of the prison were not clean enough. Elsewhere there were some disappointing findings: both
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World Prisons. (2026). HM Prison Isis. Retrieved July 21, 2026, from https://worldprisons.com/prisons/hm-prison-isis
"HM Prison Isis." World Prisons. Accessed July 21, 2026. https://worldprisons.com/prisons/hm-prison-isis.
@misc{worldprisons-hm-prison-isis,
author = {{World Prisons}},
title = {HM Prison Isis},
year = {2026},
url = {https://worldprisons.com/prisons/hm-prison-isis},
urldate = {2026-07-21}
}