In the sweltering heat of August, as Londoners escape to air-conditioned shops and cool basements, hundreds of men locked inside Wandsworth Prison face a brutal reality: temperatures soaring past 40°C in Victorian stone cells where they remain trapped for up to 20 hours a day.
The men strip down to their underwear and lie motionless on cell floors, some pressing wet towels against their skin in desperate attempts to cool down. With no fans, no air conditioning, and windows that don’t open, they endure conditions that may violate international prison standards – trapped in what amounts to stone ovens that absorbed the day’s heat and release it slowly through the suffocating night.
But perhaps most shocking is the reason why relief remains cruelly out of reach: Wandsworth Prison’s antiquated Victorian infrastructure forces staff to choose between giving prisoners a shower and preventing them from overheating.
A deadly design flaw
The 170-year-old prison’s heating system embodies everything wrong with Britain’s crumbling prison estate. Like many Victorian buildings, Wandsworth Prison relies on a single, interconnected system for both heating and hot water – the same setup found in thousands of homes across Putney built in the same era.
Hot water pipes snake through cell walls, acting as radiators that warm prisoners in winter but turn their cells into furnaces during summer heat waves. When prison staff try to provide relief by opening roof vents to release the trapped hot air, safety systems automatically shut down the boilers – cutting off hot water for showers, cooking, and basic hygiene.
It’s a lose-lose situation where staff face an impossible choice: let prisoners swelter in dangerous heat, or deny them the basic dignity of washing.
The cruel irony is made worse by the prison’s recent £22 million window replacement program. The new thick plastic windows, installed to stop the freezing drafts that plagued prisoners in winter, now trap hot air like greenhouse glass. Some desperate prisoners have reportedly damaged their new windows, preferring the risk of punishment to the certainty of heat exhaustion.
International standards under fire
The conditions may violate the Nelson Mandela Rules, international standards adopted by the UN in 2015 that require prisons to pay “due regard being paid to climatic conditions and particularly to cubic content of air, minimum floor space, lighting, heating and ventilation.” Temperature-related deaths in custody are not unheard of – with heat exhaustion particularly dangerous for prisoners who often have higher rates of diabetes, obesity, and mental health conditions that make it harder to regulate body temperature.
One haunting precedent looms large: a previous inquest at Wandsworth found that a prisoner died from heat exhaustion – remarkably, this occurred in December, highlighting just how severe the prison’s temperature management problems can be even in winter months.
Locked away from relief
What makes the situation particularly inhumane is that prisoners have virtually no control over their environment. Unlike the rest of us, who can seek shade, visit air-conditioned buildings, or step outside for relief, Wandsworth’s inmates spend most of their day locked in cells due to chronic staff shortages.
During the recent heat wave, some prisoners were confined for 21-22 hours daily, with only brief periods allowed outside their stone boxes. The prison’s governor, Andy Davy, acknowledged that “some prisoners had only 2-3 hours out of cell each day and less at weekends” during recent hot weather, partly due to increased sick leave among staff struggling with the extreme conditions.
A wider system in crisis
The temperature crisis at Wandsworth reflects broader problems plaguing Britain’s overcrowded prison system. Currently housing around 315 officers when more are needed, 47 staff were on sick leave during a recent visit of the Wandsworth Prison Improvement Committee (WPIC), with 25 more on restricted duties. These staffing shortages directly contribute to the extended lockdowns that trap prisoners in their overheated cells.
Fixing the fundamental problem would require rewiring the prison’s safety systems to allow manual override of the boiler shutdown, and re-plumbing to separate water heating from cell heating systems. But both solutions would require closing wings and moving prisoners – something the overstretched prison service refuses to contemplate.
The government has recently increased pressure on the system by jailing protesters from recent London demonstrations, adding to an already critical capacity crisis that leaves little room for essential maintenance work.
Human cost behind stone walls
As London enjoys another scorching day, spare a thought for the men locked behind Wandsworth’s Victorian walls. While we debate whether to turn on our air conditioning or complain about the heat in our offices, hundreds of prisoners face temperatures that would be considered dangerous in any other setting.
Their only crime may have been failing to pay a fine, awaiting trial for alleged offenses, or serving sentences for minor infractions. Yet they endure conditions that transform punishment into potential torture, victims of a system that prioritises cost-cutting over basic human dignity.
In a prison where only around 10% of prisoners have access to education, training or work, and where just 40 men per week – out of 1,500 inmates – can visit the library due to staff shortages, the heat crisis represents one more way that Britain’s criminal justice system fails those it claims to rehabilitate.
As temperatures are set to soar again this week, the men of Wandsworth Prison will strip down to their underwear once more, press their bodies against stone floors, and wait for night to bring modest relief. All while the rest of us remain free to escape the heat that they cannot.
