Helen Joyce has been recorded by British police as having committed a hate crime. She has no criminal record, she was never charged, never brought before a court, never even cautioned.

A complaint was made, it was logged and now it sits there – permanently – attached to her name under a little-known shadow system that allows police to record allegations of hate incidents against named individuals even when no crime has been committed and no prosecution has followed.

She mentions it almost in passing.

‘There are legal cases ongoing about whether they’re even allowed to do that,’ she says. ‘But yes, this is what is coming. This is how the ideology defends itself.’

She is not angry, she is not shaken. She is, if anything, matter-of-fact in the way that people become matter-of-fact about things that once would have appalled them but have simply become part of the landscape of their lives. That, perhaps, tells you everything you need to know about what it costs to do what Joyce has done.

Joyce, who was born in Bray in 1968 and grew up the eldest of nine children, had her first career mapped out before she ever sat a maths exam.

She wanted to be a dancer. She trained, qualified as a dance teacher and then life moved on.

She completed a PhD in pure mathematics at UCL, spent 11 years in academia, then reinvented herself entirely as a journalist at The Economist, rising to finance editor and senior editorial roles.

In 2021, she published Trans: When Ideology Meets Reality – a Sunday Times bestseller named Book of the Year by The Times, The Spectator and The Observer, and one of the most talked-about and, depending on your view, attacked and admired books published in the English-speaking world in the last decade.

She now works with Sex Matters, a UK human rights organisation focused on the legal meaning of biological sex.

She did not go looking for any of it. In 2017, a senior editor at The Economist asked if she had noticed the way young people had started identifying as trans. She hadn’t but looked into it and what she found shook her.

‘I quickly realised it was a big global theme,’ she says. ‘Then I realised people weren’t talking about it and then I realised it was very serious.’

She had expected, like most people, that the story was essentially simple – a small number of people, born into the wrong body, and now something could be done about it.

What she found was something far more consequential.

‘It was an attempt to rewrite the meaning of what it is to be human,’ she says.

‘We are an evolved species that comes in two sexes. If you rewrite what sex is, you rewrite what it is to be human.’

She wrote the article, then another and then a book. Then she became a target – though that hasn’t stopped her.

To understand how gender ideology embeds itself so quickly in a culture, Joyce reaches for a story that is both precise and deeply unsettling. In Hong Kong in the early 1990s, a teenage girl with a desperately unhappy life starved herself to death.

It was so unusual – anorexia as a Western cultural phenomenon had not taken hold there – that journalists wrote it up extensively. They searched for context, found American accounts of the illness and produced what Joyce calls unintentional explainers of how to do it.

What followed was an immediate and lasting surge in young anorexic women in Hong Kong that has never gone away.

‘Raising awareness of a script for distress does not reduce the distress,’ she says. ‘It spreads it.’

The parallel with gender ideology is, she argues, exact.

‘We’ve made the idea that it’s possible to really be a girl even though you were born a boy – or really a boy even though you were born a girl – available to everyone,’ she says. ‘We’ve embedded it in schools, told children it’s a fact, told them that anyone who disagrees is a bigot and we are now seeing the consequences.’

She sees it too in the way childhood itself has narrowed.

‘Everyone I know who has daughters says that by 13 or 14, they’re begging to wear make-up, obsessing over how they look,’ she says. ‘There are girls who aren’t 20 yet who have had quite a lot of plastic surgery.

‘So if that is your idea of what a girl is, and you are shy or spotty or a bit overweight or just not interested in any of that, you might think you’re not a girl.’

Then, along comes an ideology that confirms the feeling.

‘Once we have the idea that you might really be the opposite sex, the grass is always greener,’ she says. ‘Girls think it’s easier to be a boy, boys think it’s easier to be a girl. They are two different versions of the same toxic narrative.’

Those consequences are visible in Irish data that should give every parent in this country pause. Referrals to the gender dysphoria clinic in Dublin have reached approximately 600 a year – numbers so high the service cannot cope. But Joyce is clear that the clinic is only the most visible layer of a much larger problem.

‘The idea that you might really be the opposite sex – that has been taught in schools as fact,’ she says. ‘A lot of people under 25 in Ireland have absorbed that idea, especially those who’ve gone to university.

‘Then there’s a smaller group who end up on a medical pathway. The belief system itself is the problem, at every layer.’

The medical dimension of that belief system is where Joyce draws her most uncomfortable parallel. Medicine, she argues, has done this before – committed in good faith to a course of treatment that seemed to offer relief to genuinely suffering people, defended it vigorously against sceptics and then been forced to concede catastrophic error.

‘There was a man who had a travelling circus of lobotomies,’ she recalls. ‘He would turn up at institutions with a queue of patients prepped for him and there were people trying to stop him, trying to say, don’t bring him here. It took years.’

She sees the same pattern playing out now in the Cass Review – the landmark independent investigation into NHS gender medicine for children, carried out by Dr Hilary Cass, which concluded that the entire field had been built on essentially non- existent foundations, no robust evidence, no reliable outcome data. Puberty blockers were being prescribed on the basis of clinical ideology rather than science.

The UK subsequently banned puberty blockers for under-18s entirely. Cross-sex hormones, previously available from age 16, are now restricted to 18.

‘And still,’ Joyce says, ‘the British Medical Association’s first response was to say the Cass Review was poor quality work.’

The BMA has since conducted its own review and concluded that Cass was right about all of it.

‘You’re defending giving a child a drug specifically intended to stop them developing normally – sterilising them as a side effect – on the grounds that the doctor should have the right to decide,’ she says quietly. ‘After you’ve just agreed there was no evidence base for doing it.’

Ireland, she argues, is dangerously behind this curve. The Irish dimension of the story is, for Joyce, both the most baffling and the most clarifying part of everything she does.

‘The gap between ruler and ruled in Ireland is horrific,’ she says. ‘You have a political and institutional class moving in one direction, and the general public thinking something very different.’

Official Ireland – politicians, NGOs, the corporate sector – has become a closed loop, she argues, taking its cues from the EU and from corporate America.

‘When those two are aligned on something, Ireland follows at an institutional level,’ she says. ‘It doesn’t really matter what Irish people think.’

The evidence for that disconnect, she says, could hardly be plainer than the 2024 referenda on the constitution’s family provisions, in which every major political party campaigned for change and approximately 80 per cent of the voting public voted no.

‘Every party saying, “let’s take the word mother out of the constitution”, and the Irish people saying, “no, bloody well thank you”,’ she says.

The mechanism by which gender ideology reached Irish schools and workplaces is not, she insists, the result of some vast external conspiracy. It is something more mundane, and in some ways more troubling.

‘What you have is a system under which the Government funds NGOs, those NGOs develop policies and the government adopts them,’ she says. ‘It’s outsourcing policymaking and then rubber-stamping it.’

She points specifically to Belong To and Transgender Equality Network Ireland (TENI), both substantially publicly-funded, both significantly involved in curriculum and policy development.

She calls the broader phenomenon St George syndrome.

‘There’s no point to St George if there’s no dragon,’ she says. ‘The organisations that fought, creditably, for marriage equality found themselves, when that battle was won, needing a new cause.

‘Along comes somebody and says, for a very small investment, we will tell you exactly how to appear modern, progressive and inclusive.’

She is careful not to cast ordinary people as villains.

‘The people who put pronouns in their email signatures are not signalling that they think gender non-conforming children should be harmed,’ she says. ‘They don’t know what the full ideology is. They just think this is the modern and progressive thing to do.’

Then there is speech – and what happens to those who refuse to comply.

Joyce points to the case of Graham Linehan, the Father Ted creator, who was arrested in connection with a social media post – an experience she regards as a warning that Ireland has not taken seriously enough.

‘When you have a very detached ruling class, they become more and more convinced that the reason ordinary people don’t agree with them is that they’ve been propagandised,’ she says.

‘So they become more and more determined to control speech. They’re not willing to actually engage with why people think what they think, they just want to stop them saying it.’

This, she argues, is not incidental to the ideology but absolutely intrinsic to it.

‘There is no sense in which a man can become a woman, except linguistically,’ she says. ‘So if you want to force everyone to believe that men can become women, you have to control language. This is a movement that is based, at its core, on speech control and thought control. It’s Orwellian.

‘Ireland’s going to go the same way, believe you me. If you continue having a very divorced ruling class, it builds up pressure, and eventually you have a democratic rupture. The answer is not to silence people, the answer is to actually listen to them.’

The practical consequences of Ireland’s 2015 Gender Recognition Act – which allows any person over 16 to obtain a new birth certificate recording them as a different sex by means of a statutory declaration, with no medical assessment and no psychiatric sign-off – are still, Joyce believes, largely invisible to the Irish public, because they are largely not reported on.

‘Most people still don’t know this law exists,’ she says. ‘It was presented as an accommodation for a tiny number of greatly suffering people. What it actually does is give any man who can be bothered to fill in a form the entire legal status of being a woman.’

To explain why one legislative change can corrupt an entire legal system, Joyce reaches for the mathematical analogy at the heart of everything she does. ‘In maths, the whole system is one connected structure – every equation links with every other,’ she says. ‘If you take just one tiny equation and you say – just to make a few people happy, just in this small case – we will say that one equals zero, you can then use that equation to corrupt every single other equation in all of mathematics.

‘That is what we have done with the Gender Recognition Act. We said, just a few men can be women, just those special people, and now it is trickling out through the entire legal system. In sports, in education, in family courts, everywhere. Because you changed one equation.’

People ask why this is the hill. She finds the question baffling.

‘What’s minor about lying to children about the nature of the human race in ways that harm all of them?’ she asks. ‘What’s minor about telling gay people that their sexuality isn’t based on same-sex attraction? What’s minor about a movement that is corrupting medicine, corrupting public records, corrupting sport, encouraging some of the worst people in the world to misuse the criminal justice system against those who disagree?

‘It’s not minor. It’s as fundamental as it gets.’

She thought, when she wrote the book, that she could get it out of her system. She laughs at herself for that now.

‘I thought the ideology was so completely mad that if I could just say to someone, if you say men can be women, you will eventually end up putting a rapist in a women’s jail, I thought they’d go, oh my God, you’re right,’ she says. ‘It turns out they don’t re-examine it at all. They just say you’re a bigot.’

She has not moved on. She has lost friends, gained what she describes as more interesting and nicer ones, and she gets up every day and goes back to the fight.

‘I don’t think I ever had a cause before,’ she says.

‘I have landed on something that is so important and I think there’s nothing better I could be doing with my time.’

This is the hill she is prepared to die on. And from where she stands, the view is very clear.

Trans: When Ideology Meets Reality by Helen Joyce is published by Oneworld Publications. She works with Sex Matters at sexmatters.org