Nell Nockles

How it started

Nell Nockles was born Helen Louise Cantillon in Cleveland, Ohio. She met her future husband, Tony Nockles, while he was on a work trip in Put-in-Bay, Ohio. Shortly after, they were married and moved to England in 1968, eventually settling in East Molesey, Surrey.

Over the years, Nell's asthma had been slowly worsening, largely unnoticed, until it became serious enough that doctors gave her a prediction on how long she had left to live. It was at that point, frightened and looking for answers, that a family friend, the late Dr Alan Miller, first suggested that house dust mites, specifically, were worth her attention. It was an offhand hint from Alan, not a referral from a clinic, that set the direction for the rest of her life.

In 1996, a television programme by Dr Jill Warner (then a trustee of Asthma UK) described the role of house dust mites in triggering asthma, confirming what Alan had already told her. With her attention now honed on the mite, she followed the advice. She stripped the bedroom, got an air mattress, cut exposure where she could. Her symptoms improved enough that a planned sinus operation was cancelled.

That was enough to make her want to know why.

She went to the British Library. She found research. She found more. She began attending public allergy research meetings led by Professor Jonathan Brostoff and the Allergy Research Foundation. What started as a patient's inquiry into her own health became something else: a sustained, decades-long investigation into the creature that had made her ill, and into the medical and institutional landscape that surrounded it.

The Pilgrim Bed

Her first major contribution was a device. Working with Tony, she developed the Pilgrim Bed: a five-part allergen recognition and avoidance sleeping system for asthmatic children, built around an air mattress and designed to cut exposure to house dust mite allergens at the source. It was patented as a Class 1 medical device.

An NHS-funded pilot study, the Health Gain Study: Allergen Avoidance Programme for Children Aged 5-15, ran through East Surrey Health Authority in 1998. The device received endorsements from some of the leading names in UK allergy medicine: Professor Stephen Holgate, Professor Jonathan Brostoff, Professor John Warner, and Dr Glenis Scadding. In 2000 it was awarded Millennium Product for Innovation status, and the British Library recognised it as a contribution to research and innovation. The family appeared on the television programme I Wish I'd Thought of That.

The Pilgrim Bed didn't succeed commercially. But the knowledge Nell had built in developing it had to go somewhere. The website came next. What began as housedustmite.org eventually became housedustmite.com, a free public resource for patients and parents that she would maintain and expand for the rest of her life.

What she was arguing

The core of Nell's research was a claim that had powerful enemies.

She believed that house dust mites were systematically underweighted as a cause of asthma and allergy in the UK, and that pharmaceutical treatment, rather than allergen avoidance, had become the institutional default for commercial and structural reasons. She traced this argument to a 1992 Royal College of Physicians guideline meeting at which, she argued, HDM avoidance had been quietly dropped from the first British Thoracic Society asthma guidelines. She wrote this up as a historical essay she called "The Marketing of Asthma."

Her research also went further than allergy. She gathered evidence that house dust mites carry harmful bacteria, including methicillin-resistant Staphylococcus aureus (MRSA), and that this had been systematically ignored by UK public health bodies. She corresponded with mite evolutionary biologist Dr Pavel Klimov at the University of Michigan, making lateral connections between his microbiome research and clinical case reports on bacterial meningitis she found in her own reading. She wrote to the Chief Medical Officer and Public Health England. She later described the experience as "a stunning example of ignorance... a powerful example of a 'closed-shop' mentality."

Her approach was characteristic: read the primary literature across fields, spot the connection no one else had made, then write directly to the scientist who needed to know. Writing to one of the world's leading HDM immunologists in 2022, she asked:

"Do you know if any research group has looked into killing house dust mites by drowning them in a pre-wash of biological detergents? Detergents such as Ariel? They must be vulnerable to enzymatic activity of the detergent. It just seems logical." Nell, writing to Professor Tom Platts-Mills, University of Virginia, October 2022

The campaigns

Three campaigns ran through most of her later decades.

The first was her conflict with Asthma UK, or rather with the way allergy charities in the UK had structured themselves. Nell and Tony had filed a formal complaint with the Charity Commission decades earlier, alleging that the Chairman and Finance Director of Asthma UK (then the National Asthma Campaign) were simultaneously directors of an investment firm that advised clients on novel drugs, including asthma drugs. The Chairman was asked to step down. The Finance Director was asked only to apologise, and remained in post. In October 2024, Nell raised the matter again with Dr Margaret McCartney, a GP and medical journalist known for her work on conflicts of interest in healthcare, who responded quickly and supportively. Nell described the case as "proven but unresolved." It still was.

The second, and longest, was her campaign on Safe Sleep Guidelines for Infants. She first wrote to the Chief Medical Officer on this subject in 2016, arguing that the NHS guidelines failed to warn parents of the sensitisation risks from house dust mite exposure in early infancy. Published evidence showed that some babies are born already sensitised to HDM, and that an active enzyme from HDM droppings has been found in foetal fluid. Over the following decade she wrote to the Lullaby Trust, NICE, local child death review panels, and safe-sleep guideline authors on both sides of the Atlantic. She was consistently met with the same response: not enough evidence, not enough consensus.

In February 2025 she wrote to her MP Monica Harding, asking her to put a Parliamentary question. Her letter stated plainly:

"The guidelines fail to warn of the health risks from exposure to house dust mites (HDM), a known cause of sensitisation and allergy. Furthermore, an active enzyme found in HDM droppings has been found in foetal fluid and some babies are born sensitised to HDM." Nell's letter to Monica Harding MP, February 2025

The letter was forwarded to the Department of Health in May. She was still waiting for a reply in October 2025. During Baby Loss Awareness Week she wrote to BBC Radio 4's Today programme: "The modifiable risks are known but not acknowledged in NHS Guidelines for Infants." This was the longest campaign of her research life, and it was unresolved when she died.

The third campaign ran through her local MP. Dominic Raab represented the Esher and Walton constituency where Nell and Tony lived, and for years served as a lever to reach the Department of Health. In April 2024, after running into him on the street during a constituency visit, she wrote the same afternoon:

"I would welcome meeting you for a coffee or relaxed lunch to ask your advice on how to proceed with my mission to expand public knowledge of the harm house dust mites inflict on the vulnerable — mainly children. There must be a pathway I've not yet explored. I have an idea that is new and could make a difference." Nell to Dominic Raab MP, April 2024

Raab agreed to write to the Department of Health on her behalf. When he resigned from Parliament later that year, she transferred the case to the new MP and kept going.

The allies

She wasn't working alone. Her closest late-life collaborator was Catherine Sutton, an advocate associated with Airborne Allergy Action who briefed politicians, spoke at clean air conferences, personally briefed Professor Stephen Holgate on the Allergy Tsar campaign, and ran a dust mite blog circulated by respiratory professional societies. Their correspondence runs from 2021 to November 2025. When Nell suggested looking for a sympathetic journalist after the Raab letter, Catherine was direct: "To be honest I think journalists are part of the problem. It is better to pursue this with the politicians and local mayors now."

Nell replied: "I recall a journalist friend saying, I can't help you, I'll lose my retainer from the Big Pharma. Sad!"

Dr Harry Morrow Brown, a physician and generous supporter of Nell's research, gave years of his own microscope photography to the site: striking images of mite droppings and their digestive enzyme that still illustrate several research pages today, credited there as gifts from "the late Dr Harry Morrow Brown." In a May 2025 email to Edward, celebrating that Google had just named housedustmite.com the best resource on the subject, Nell signed off by recalling his words of encouragement: "Keep Going," said Dr Harry Morrow Brown, WE ARE.

She corresponded with Professor Tom Platts-Mills at the University of Virginia, one of the world's pre-eminent HDM immunologists, addressing him as "Dear Tom" and citing specific papers. In 2024 she asked him to consider the life's work of Professor Robin Coombe on cot death: "Shame, that his life-long hypothesis was never taken seriously. Can you help?"

She was connected to Professor Glenis Scadding, the retired allergy specialist who had endorsed the Pilgrim Bed years earlier. When Scadding declined to lend her name to the 2025 parliamentary letter on grounds of retirement, she redirected Nell to Professor Angela Simpson at Manchester. Nell wrote to Simpson within three months.

In December 2024, she wrote to tell Catherine that her essay on the evolutionary history of house dust mites, tracing the mite's lineage back to the age of the dinosaurs, had attracted the interest of the Natural History Museum's identification team, the mite biologist Professor Barry O'Connor at Michigan, and Sir David Attenborough. She noted this in passing, as a fact: "Sir David Attenborough found my 'essay' of interest. It was good of him to comment!"

The final chapter

In early 2025, Nell was battling cancer. She disclosed this in a February email to her friend and neighbour Emma Simpson, who had written to say: "You are my hero! I love that you have worked so tirelessly on this cause for so long."

Nell replied that she had had "a difficult winter battling cancer and trying to stay on the planet." Then she returned immediately to the subject at hand: "I'm still plodding away at trying to 'crack into' the drug stranglehold on asthma."

Her last structured project was a series of short educational videos called Snippets Stacked, planned in five parts: how mites make droppings to feed the colony, why they live in colonies, the Der p1 enzyme (she described it as acting "like a meat tenderizer, mange like"), the diseases HDM cause including delayed-reaction conditions, and why mites die in a normal wash. The planned sign-off: Don't sleep with mites.

She sent the outline to her son Edward in July 2025: "What do you think? Love ya to bits xxx."

She asked her son Richard, a film producer at Surround Vision, to edit the final video. In November 2025 she sent the finished version to Catherine Sutton, apologising for a silence caused by "health issues too boring to explain," asking her to help share it on Instagram. She closed warmly: "Love to you and the drive to clean air in schools. So important in student attention, retention and learning."

The last dated message in her email archive is from 28 December 2025. The subject line reads: what bacteria do house dust mites carry? The exact question she had been chasing since at least 2021, through correspondence with mite biologists, letters to Public Health England, and articles on this site. There is no recipient listed. She was still researching.

She died on 9 March 2026. She was 83.