In the maternity wards of Basildon Hospital, those entrusted with bringing life into the world were quietly being harmed by the very tools of their care. Between 2021 and 2023, 121 NHS staff — most of them midwives — breathed nitrous oxide at concentrations up to thirty times the legal limit, suffering in silence while their employer sat on the evidence. The resulting £735,000 settlement, the largest group legal action ever brought by UK midwives, is less a resolution than a reckoning — a reminder that the duty of care owed to patients must extend, without exception, to those who provide it.
NHS settles landmark £735k nitrous oxide exposure case with 121 maternity staff
121 NHS staff experienced prolonged exposure to dangerous nitrous oxide levels, suffering fatigue, anxiety, headaches, and cognitive impairment over months to years.
They should never have been put at risk in the first place.
Mark
Why does it matter that this is the largest group legal action by midwives? What does that tell us?
Mimi
It signals that midwives have rarely had to band together like this before. The scale—121 people, £735,000—suggests a systemic failure, not an isolated incident. It's also a statement: midwives are willing to fight back when their safety is ignored.
Luke
But we should be careful here. The RCM says it's the largest; NHS Resolution says they're unaware of a larger one. Those aren't quite the same thing. And one claim is still outstanding, so the full picture isn't settled yet.
Mark
The trust knew in 2021 but didn't tell staff until 2022. Why the delay?
Mimi
The source doesn't explain the reasoning. We know it happened, but not why. That's a gap worth noting.
Luke
Exactly. Was it bureaucratic slowness, deliberate concealment, or something else? The timeline is clear—the delay is documented—but the motive remains opaque. The trust apologised, which suggests they acknowledge it was wrong, but they haven't explained the decision-making.
Mark
What does 30 times the legal limit actually mean for a person's body?
Mimi
The staff reported fatigue, anxiety, headaches, and brain fog. Those are the concrete symptoms we know about. But the source doesn't detail whether there are long-term effects, whether the symptoms resolved after exposure ended, or whether some staff are still affected.
Luke
Right. We have the exposure level and we have the reported symptoms, but we don't have medical documentation of causation or prognosis. The compensation suggests harm, but the nature and duration of that harm isn't fully spelled out in the reporting.
Mark
What happens now?
Mimi
The RCM has alerted all NHS trusts and worked with the Health and Safety Executive to improve guidance. That suggests this could prompt wider safety reviews.
Luke
That's the forward-looking part, but it's still conditional. We don't know if other trusts will face investigations, or if this will lead to mandatory audits. The RCM's action is real, but its impact is still unfolding.
Il Polso
- For two years, midwives at Basildon Hospital absorbed a toxic gas at thirty times the legal limit during long shifts, developing fatigue, anxiety, and a brain fog that lingered long after they left the ward.
- The trust commissioned safety tests, learned the results were damning, and then withheld that information from its own staff for sixteen months — a silence that allowed the harm to deepen.
- Even after workers were finally told in 2022, another full year elapsed before protective measures were installed, a delay the solicitor representing staff called a straightforward failure of basic duty.
- A £735,000 settlement — the largest of its kind in UK midwifery — has now been confirmed, though one claim remains unresolved and the financial award cannot reclaim the months of exposure that preceded it.
- The Royal College of Midwives has written to every NHS trust in England, worked with the Health and Safety Executive to strengthen national guidance, and signalled that Basildon may be the first of many maternity units to face systemic scrutiny over how medical gases are managed.
In the maternity wards of Basildon Hospital, those entrusted with bringing life into the world were quietly being harmed by the very tools of their care. Between 2021 and 2023, 121 NHS staff — most of them midwives — breathed nitrous oxide at concentrations up to thirty times the legal limit, suffering in silence while their employer sat on the evidence. The resulting £735,000 settlement, the largest group legal action ever brought by UK midwives, is less a resolution than a reckoning — a reminder that the duty of care owed to patients must extend, without exception, to those who provide it.
At Basildon Hospital in Essex, 121 NHS staff — 85 of them midwives — have received £735,000 in compensation after years of dangerous exposure to nitrous oxide, the gas used to ease pain during labour. The settlement is the largest group legal action ever brought by midwives in the United Kingdom.
Between 2021 and 2023, staff were breathing the gas at concentrations reaching thirty times the legal workplace limit. Across long shifts and many months, they developed fatigue, anxiety, persistent headaches, and a cognitive cloudiness many called brain fog. What made the harm harder to bear was the knowledge that it was preventable: the trust had commissioned tests, received alarming results, and chosen not to tell its workforce for sixteen months.
When staff were finally notified in 2022, a further year passed before scavenger equipment was installed to extract the gas and stop it accumulating. Daniel Poet, the solicitor who represented the workers, described the timeline as a failure of basic duty. Gill Walton of the Royal College of Midwives was equally direct — midwives were caring for mothers and newborns while unknowingly breathing poison, and the delayed disclosure was, in her words, simply not acceptable.
The Mid and South Essex NHS Foundation Trust has since apologised and acknowledged it should have acted faster. One claim from the original group remains unsettled. More significantly, the case has moved beyond Basildon: the RCM has alerted every NHS trust in England to the risks of nitrous oxide exposure and has worked with the Health and Safety Executive to update national guidance — a signal that other maternity units may soon face the same uncomfortable questions.
At Basildon Hospital in Essex, 121 NHS staff members—85 of them midwives—have received compensation totalling £735,000 after being exposed to dangerous levels of nitrous oxide over an extended period. The settlement, confirmed by NHS Resolution, represents the largest group legal action ever brought by midwives in the United Kingdom, according to the Royal College of Midwives.
Nitrous oxide, commonly known as Entonox, is a gas administered to women during labour to provide temporary pain relief. Between 2021 and 2023, staff at Basildon breathed in the gas at concentrations reaching 30 times the legal workplace exposure limit. Over months and years of long shifts, they developed fatigue, anxiety, headaches, and what many described as brain fog—cognitive symptoms that persisted long after exposure ended. The internal hospital report documenting these levels was damning in its specificity: the trust had known about the danger since 2021 but kept the information from its workforce.
The delay in disclosure compounded the harm. Staff were not informed of the test results showing breached safety thresholds until 16 months after the trust commissioned them. Even after that notification in 2022, another full year passed before safety measures were actually introduced. Daniel Poet, the solicitor who represented the workers, framed the timeline as a failure of basic duty: the trust knew the risks, concealed them, and then moved slowly to fix the problem. "They should never have been put at risk in the first place," he said, and the settlement—while substantial—cannot undo the months of exposure that preceded it.
Gill Walton, chief executive of the Royal College of Midwives, spoke to the particular sting of the breach. Midwives were caring for women and babies while breathing poison, unaware of the danger. "Even once the problem had been discovered, it was more than a year before staff were told," Walton said. "That is simply not acceptable and no midwife should ever be treated that way." She positioned the settlement as a warning to other NHS employers: protect your staff, or face accountability.
The Mid and South Essex NHS Foundation Trust acknowledged the failure. Louise Crosby, the chief nursing and quality officer, said the trust should have acted faster and apologised to staff. The hospital has since installed scavenger equipment at the maternity unit to extract the gas and prevent accumulation. The trust stated that women can now have confidence the use of Entonox is safe.
The Royal College of Midwives has moved beyond Basildon. It has written to every NHS trust in England alerting them to the risks posed by nitrous oxide exposure and has raised concerns about Basildon's delayed response with the Health and Safety Executive. Working directly with the HSE, the RCM has updated and improved national guidance on the use of Entonox. One claim from the original group remains unsettled. The case has shifted from individual compensation to systemic scrutiny—a signal that other maternity units may face similar questions about how they monitor and manage medical gases.
Citazioni salienti
The trust knew about the dangers in 2021, but staff weren't told until the following year and it took another year for safety measures to be introduced. That delay is unacceptable.— Daniel Poet, Thompsons Solicitors
For years, midwives at Basildon were breathing in nitrous oxide at dangerous levels while they cared for women and babies. Even once the problem had been discovered, it was more than a year before staff were told. That is simply not acceptable.— Gill Walton, Royal College of Midwives
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