Before the Evidence Settles: Labour’s Conversion Practices Bill and the limits of legislative certainty
Labour’s Draft Conversion Practices Bill raises a constitutional question that reaches beyond today’s politics. When medicine, psychology and philosophy are themselves revising long-held assumptions, should Parliament use the criminal law to settle questions that remain intellectually unresolved?
English law has generally been suspicious of governments that claim authority over questions of conscience. The State may punish violence because violence can be established. It may punish theft because property can be identified. It may punish fraud because deception can be proved. It has traditionally proceeded more cautiously where the question before it is not whether something happened but what something means. That distinction, never perfectly observed, nevertheless helped to define the constitutional character of the common law. Governments possessed many legitimate powers, but they did not possess every power. Some questions were recognised as lying beyond the ordinary competence of politics.¹
That restraint emerged from experience rather than theory. Europe’s religious wars, the constitutional upheavals of the seventeenth century and the gradual development of religious toleration all pointed towards the same conclusion: governments are poor arbiters of disputed truth. They may preserve public order, but they cannot manufacture intellectual consensus. The law can regulate conduct with relative confidence. It is far less successful when it attempts to resolve questions upon which philosophy, religion and science themselves continue to disagree.²
None of this suggests that the State should be morally neutral. Every legal system rests upon moral assumptions. Laws against murder presume that human life possesses value. Laws protecting children presume that childhood deserves particular care. Equality before the law assumes that every person possesses an inherent dignity independent of wealth, influence or social standing. Parliament therefore legislates from moral premises whether it acknowledges them or not. The more difficult question is whether those premises have become sufficiently settled to justify the coercive power of the criminal law.³
That question has acquired increasing importance as governments have assumed responsibilities once exercised largely by families, churches, universities and the professions. Education, healthcare, safeguarding and equality law have all expanded the reach of the modern administrative state. Much of that expansion has brought genuine benefits. Children are better protected from abuse than they once were. Public authorities are more accountable. Discrimination is less readily tolerated. Few would wish to reverse those developments.
Every extension of State authority, however, carries with it a corresponding obligation to recognise the limits of institutional competence. Medicine, psychology, philosophy and theology ask different questions and employ different methods. Their conclusions often inform legislation, but they are not themselves legislative disciplines. They advance through observation, criticism, disagreement and revision. Criminal law proceeds differently. Once Parliament creates an offence, the police investigate, prosecutors charge and courts punish. That process demands definitions capable of consistent application. Ambiguity may be acceptable in academic debate. It is far less acceptable where personal liberty is at stake.⁴
For that reason, good legislation has generally followed rather than anticipated settled knowledge. Parliament did not invent modern medicine; it legislated upon conclusions that medicine itself had reached. It did not establish scientific method; it responded to scientific discovery. Even then, history offers repeated reminders that confidence can outrun evidence. Medical orthodoxies have changed. Scientific consensus has sometimes proved incomplete. Public policy has required revision. Those reversals are not signs of institutional failure but of intellectual honesty. They remind legislators that certainty is sometimes provisional.⁵
The relationship between law and medicine illustrates the point particularly clearly. Medicine advances by questioning its own assumptions. New evidence modifies old conclusions. Treatments once regarded as breakthroughs are abandoned or qualified. Others survive because they withstand prolonged scrutiny. The process is rarely straightforward, but it reflects an important principle: knowledge develops.
The criminal law develops more slowly. Stability is one of its principal virtues. Citizens are entitled to know what conduct attracts criminal sanction and why. Legislators therefore face a recurring dilemma. If they legislate too late, genuine harms may remain insufficiently addressed. If they legislate too early, they risk giving legal permanence to propositions that subsequent evidence substantially revises.⁶
That dilemma has become increasingly familiar wherever public policy intersects with rapidly developing areas of science, medicine and psychology. Questions once left almost entirely to professional judgment now appear before legislatures, courts and regulators. Reproductive medicine, assisted dying, artificial intelligence, neurodiversity and childhood mental health all illustrate the same constitutional difficulty. Parliament is often required to legislate while the relevant disciplines continue refining their understanding of the subject itself.
The debate surrounding conversion practices belongs within that broader pattern. Public discussion frequently assumes that it concerns a single, clearly identifiable form of abuse. Certainly, there have been practices that deserved unequivocal condemnation. Coercive attempts to alter a person’s sexual orientation through intimidation, degrading treatment or psychological pressure have no place in a civilised society. Existing criminal law already prohibits many such acts through offences including assault, coercive control, harassment, child cruelty, false imprisonment and fraud.⁷ The question before Parliament is therefore not whether abuse should be prohibited. It is whether new criminal offences can be defined with sufficient precision to prohibit abuse without simultaneously drawing ordinary therapeutic practice, parental guidance, religious ministry or conscientious clinical judgment into the sphere of criminal investigation.
That distinction has become more difficult because modern safeguarding rightly recognises that psychological harm may be as serious as physical injury. Yet psychological harm is also more difficult to define. It depends not only upon what was said or done but upon intention, context, vulnerability and interpretation. Those matters are frequently the proper subject of professional judgment. Once they become the basis of criminal liability, precision becomes indispensable.
It is against that constitutional background that Labour’s Draft Conversion Practices Bill should be understood. Ministers have consistently stated that the proposed legislation targets abusive conversion practices rather than ordinary conversation, responsible parenting, legitimate healthcare or religious belief.⁸ Those assurances deserve careful consideration. They also deserve careful scrutiny. Criminal statutes do not operate solely through ministerial intention. Their practical meaning emerges through police investigations, prosecutorial decisions, judicial interpretation and professional regulation. Their consequences are determined not only by what governments intend but by what the law ultimately permits.
Whether the present legislation achieves that balance cannot be determined simply by reading the Bill in isolation. It depends equally upon the state of knowledge upon which Parliament is being asked to legislate. That is where the present debate becomes unusual. Far from consolidating an established professional consensus, the Bill arrives during one of the most significant periods of reassessment in modern British medicine. Assumptions that only a few years ago were presented as settled have become the subject of sustained clinical review, official inquiry and institutional reform.⁹
To understand why that matters, it is necessary to leave Westminster for a moment and examine what has been happening elsewhere. The story begins not in Parliament but in the consulting room.
The reassessment did not begin in Westminster. It began within medicine itself.
For much of the previous decade, the public was repeatedly assured that there existed a broad professional consensus regarding the treatment of children and adolescents experiencing gender distress. Schools adopted policies encouraging social transition. Healthcare increasingly embraced what became known as an “affirmative” approach. Professional bodies revised guidance. Public authorities altered policies and terminology. Although disagreement certainly existed, the prevailing impression conveyed to the public was one of settled knowledge. Questions that had once belonged largely to psychiatry and developmental psychology increasingly appeared resolved.¹⁰
That confidence matters because it forms the backdrop against which the present legislation is being introduced. If Parliament is entitled to create new criminal offences in this area, it is reasonable to ask what evidence persuaded legislators that the underlying questions had become sufficiently settled to justify doing so.
The answer, at least until recently, appeared straightforward. Gender dysphoria was understood principally through the lens of affirmation. A child who consistently identified as a member of the opposite sex was widely assumed to benefit from having that identity recognised and supported. Delaying affirmation was often described as increasing the risk of depression, anxiety and self-harm. Although the details differed between institutions, the broad direction of travel was unmistakable. Public policy increasingly reflected the assumption that affirming a child’s declared gender identity represented the safest and most compassionate course.¹¹
The difficulty is that the evidential foundations of that confidence began to attract increasing scrutiny from within the very professions that had done most to establish it.
The turning point came not through political intervention but through clinical review. Commissioned by NHS England, Dr Hilary Cass was asked to examine the evidence underpinning services for children and young people experiencing gender dysphoria. Her task was neither theological nor ideological. It was clinical. She was asked a question familiar to every branch of medicine: does the evidence support current practice?¹²
Her conclusions altered the debate.
The Cass Review concluded that the evidence supporting puberty blockers and cross-sex hormones for children experiencing gender dysphoria was remarkably weak. It found that many young people presenting to gender services also experienced complex combinations of autism, neurodevelopmental conditions, anxiety, depression, trauma, family difficulties and other mental-health challenges requiring careful, individual assessment rather than assumptions centred principally upon gender identity. It further concluded that the influence of peer groups, social media and online communities had not been adequately understood within existing clinical pathways.¹³
Perhaps the most significant observation received comparatively little public attention. The Review acknowledged concerns that some same-sex-attracted young people might be entering pathways of medical transition before they had been given sufficient time and support to understand and accept their sexuality. It did not suggest that every child had been misdiagnosed, nor that every clinician had acted improperly. It did, however, recognise that adolescent development is frequently complex, that sexuality often continues to mature during adolescence, and that premature certainty may itself carry clinical risks.¹⁴
The consequences were substantial.
The Gender Identity Development Service at the Tavistock and Portman NHS Foundation Trust, for many years England’s principal specialist clinic for children experiencing gender dysphoria, had already become the subject of increasing concern. Former clinicians questioned aspects of its assessment procedures and clinical culture. The Care Quality Commission criticised elements of the service, and NHS England subsequently decided to replace the national clinic with regional multidisciplinary centres intended to provide broader psychological, psychiatric and paediatric assessment before medical intervention was considered.¹⁵
Clinical practice changed alongside institutional reform. NHS England ended the routine prescription of puberty blockers outside formal research protocols and initiated further review of cross-sex hormones for minors. Similar reassessments occurred elsewhere in Europe, including Sweden, Finland and Norway, where health authorities concluded that the available evidence justified significantly greater caution than had previously been assumed.¹⁶
These developments did not demonstrate that gender dysphoria is unreal or that every previous clinical decision was mistaken. Medicine rarely advances through such simple reversals. They demonstrated something more important: that a field previously presented as settled had entered a period of substantial professional reconsideration.
That process continues.
The independent investigation into WellBN’s management of children and young people in Brighton reinforced many of the concerns already emerging elsewhere. Examining the treatment of seventy-eight children and young people, investigators concluded that the service had “fallen far short of what could be considered safe or appropriate”. Specialist expertise proved insufficient. Clinical governance was inadequate. Physical examinations were frequently omitted. Clinical records were poor. Procedures for obtaining informed consent were deficient. Specialist counselling concerning fertility was absent. These were not disagreements about political philosophy. They were findings concerning clinical governance measured against ordinary standards of medical practice.¹⁷
Taken together, the Cass Review, the closure of Tavistock, NHS England’s revised clinical pathway and the findings concerning WellBN tell a coherent story. They do not establish a new orthodoxy. Rather, they reveal the disappearance of an old one. Confidence has yielded to caution. Medicine has begun asking questions that, until recently, were frequently treated as already answered.
That development has received comparatively little attention during discussion of the proposed Conversion Practices Bill.
If medicine has become more cautious about encouraging children towards social and medical transition, Parliament should perhaps become more cautious before criminalising those who counsel patience, exploration or acceptance of biological reality.
It is here that the meaning of “conversion” itself deserves closer examination.
For decades the phrase “conversion therapy” referred almost exclusively to attempts to change a person’s sexual orientation. Such practices, particularly where coercive or degrading, deserved the criticism they received. The contemporary landscape, however, presents a different phenomenon.
Arguably, the clearest contemporary example of an attempt to change a child’s identity is no longer the long-discredited effort to make homosexual people heterosexual. It is the medicalisation of some gender-nonconforming and same-sex-attracted children. Instead of being helped to become comfortable with their developing bodies and emerging sexuality, some have been encouraged to interpret ordinary adolescent distress, discomfort with puberty or same-sex attraction as evidence that they were “born in the wrong body” and should instead become members of the opposite sex.¹⁸
A growing number of detransitioners describe precisely that experience. Boys who might otherwise have understood themselves as gay came to identify as heterosexual women. Girls who might otherwise have grown into lesbians instead came to identify as heterosexual men. In such cases, same-sex attraction disappears not because it has been accepted but because it has been reinterpreted through a different conception of identity. The Cass Review’s recognition that some same-sex-attracted adolescents may have entered medical pathways before fully understanding their sexuality lends particular significance to those accounts.¹⁹
That observation should not be overstated. Not every transgender-identifying young person is same-sex attracted, and not every individual who transitions later regrets doing so. Nevertheless, the evidence now available introduces a profound irony into the present debate.
The legislation proceeds upon the assumption that attempts to reconcile a child with his or her biological sex may constitute an abusive conversion practice. Yet it remains largely silent regarding ideological or clinical influences that may encourage vulnerable children to reject that same biological reality.
If the object of the law is genuinely to protect vulnerable young people from coercion and identity-based pressure, that asymmetry requires explanation. Parliament cannot simply assume that influence operating in one direction is inherently suspect while influence operating in the other is necessarily affirming. The evidence emerging over recent years suggests that the reality is considerably more complex than such a distinction allows.
It is precisely because the evidence has become more complex that legislation should proceed with unusual care. Criminal law is a poor instrument for resolving questions that medicine itself continues to investigate.
The significance of the Draft Conversion Practices Bill therefore extends well beyond the legislation itself.
Parliament is not merely deciding whether particular forms of conduct should attract criminal sanction. It is also deciding how a liberal democracy ought to legislate when the underlying questions remain matters of continuing medical, philosophical and religious disagreement. That distinction is easily overlooked because the language of public debate has become increasingly polarised. Supporters present the Bill as a straightforward measure against abuse. Critics portray it as an assault upon freedom. The reality is more complex than either description allows.
No democratic society can avoid making judgments about harm. Criminal law necessarily distinguishes between conduct that ought to be tolerated and conduct that ought to be prohibited. Yet the legitimacy of those judgments depends upon an equally important principle: governments must recognise the limits of their own competence. They possess expertise in maintaining public order. They do not possess unique authority in psychology, medicine, philosophy or theology. Their responsibility is to create a legal framework within which those disciplines may continue pursuing truth, not to resolve their disagreements through the criminal law.
That principle has acquired renewed importance as public institutions have become increasingly involved in questions that previous generations regarded primarily as matters for families, schools, clinicians and religious communities. The modern State has assumed responsibilities that would once have seemed extraordinary. It determines educational curricula, regulates professional practice, establishes safeguarding standards and increasingly influences the language through which public bodies describe identity itself. Much of that development has arisen from entirely legitimate concerns. Children deserve protection. Public services require consistent standards. Citizens should not suffer unjust discrimination. None of those propositions is controversial.
The question is whether the State’s growing responsibilities have also encouraged a growing confidence in its own ability to resolve questions that remain intellectually unsettled.
The present debate illustrates the difficulty.
A priest counselling a distressed adolescent to accept his biological sex may believe he is expressing a theological conviction concerning creation and the unity of body and soul. Parents encouraging their child to postpone irreversible medical decisions may believe they are exercising ordinary parental responsibility. A psychotherapist exploring trauma, autism, family relationships or emerging sexuality before affirming a new gender identity may regard such exploration as the essence of responsible clinical practice. Each approaches the same child from a different discipline. None necessarily intends harm. Each nevertheless proceeds from a different understanding of what constitutes human flourishing.
That diversity of judgment is not evidence that society has failed. It is evidence that the questions themselves remain difficult.
The Government has repeatedly stated that the Draft Conversion Practices Bill will not criminalise ordinary parental guidance, legitimate psychotherapy, responsible healthcare or religious belief. Those assurances matter. They should also be reflected with unmistakable clarity in the legislation itself. Criminal law cannot depend upon ministerial intention alone. It must remain sufficiently precise that citizens, police officers, prosecutors and judges understand where the boundary between prohibited coercion and lawful disagreement actually lies. Ambiguity in criminal statutes rarely favours liberty.
Recent experience provides additional reason for caution.
British courts have recognised that gender-critical beliefs are protected philosophical beliefs within the meaning of the Equality Act. Individuals remain free to believe that biological sex is real, immutable and socially significant. At the same time, a growing number of cases demonstrate that the legal protection of belief does not necessarily prevent professional or institutional consequences for expressing it. Public appointments have been withdrawn. Employees have faced disciplinary proceedings. Advisory bodies have excluded dissenting voices. Whether every individual decision was justified is less important than the cumulative pattern. It illustrates how rapidly social disagreement can become institutional orthodoxy without Parliament ever expressly requiring it.²⁰
My own experience reflects that broader development. Following the judgment in Smith, I found myself effectively excluded from public service because I continued to affirm beliefs that the courts themselves recognised as protected. The lesson was not that legal protection is meaningless, but that formal rights and practical liberty are not always identical. Citizens may retain the theoretical freedom to hold certain beliefs while discovering that expressing them increasingly carries professional or civic consequences.²¹
That distinction should concern those who support the legislation no less than those who oppose it. Constitutional safeguards are rarely created for the benefit of today’s majority. They exist to protect tomorrow’s minority. Every generation assumes that its own moral certainties are uniquely well founded. History repeatedly demonstrates otherwise. The purpose of freedom of conscience is not to guarantee that any particular belief is correct. It is to preserve the conditions under which truth may continue to be sought, tested and, where necessary, corrected.
This is why the present debate ultimately concerns more than conversion practices.
It concerns whether Parliament should employ the criminal law to reinforce one contested understanding of the human person at precisely the moment when medicine itself has become more cautious about many of the assumptions that previously underpinned it.
That caution is not weakness. It is intellectual maturity.
The Cass Review did not resolve every question surrounding childhood gender dysphoria. Nor did the WellBN investigation. Neither claimed to do so. Both nevertheless demonstrated the importance of resisting premature certainty where children’s lifelong welfare is concerned. Good medicine proceeds carefully because its mistakes cannot always be undone. Good legislation should display the same humility.
Abuse deserves prohibition. Coercion deserves punishment. Fraud deserves prosecution. Existing criminal law already addresses many such harms. Parliament may conclude that additional measures are required. If so, those measures should be drafted with exceptional precision, recognising both the gravity of the conduct they seek to prevent and the constitutional freedoms they inevitably engage.
The challenge before legislators is therefore neither ideological nor theological. It is constitutional.
Can the law prohibit genuine abuse without discouraging honest clinical inquiry?
Can it protect vulnerable people without narrowing the space for legitimate parental guidance?
Can it safeguard children without assuming that one disputed account of identity has become so certain that disagreement itself warrants criminal investigation?
Those are not easy questions.
They are precisely the sort of questions that free societies ought to ask before creating new criminal offences.
Perhaps that is the enduring lesson of this debate.
Legislation is often presented as the end of public argument. In reality it should be its conclusion. Criminal law is strongest when it reflects knowledge that has been patiently tested, openly debated and widely accepted. It is at its weakest when asked to settle disputes that the relevant disciplines themselves continue to examine.
Parliament now faces precisely that responsibility.
The evidence should settle before the law does.
Notes
1. See generally Albert Venn Dicey, Introduction to the Study of the Law of the Constitution, 8th ed. (London: Macmillan, 1915); A. W. Bradley, K. D. Ewing and C. J. S. Knight, Constitutional and Administrative Law, 18th ed. (Harlow: Pearson, 2022).
2. John Locke, A Letter Concerning Toleration (1689); T. G. A. Pocock, The Ancient Constitution and the Feudal Law (Cambridge: Cambridge University Press, 1987).
3. European Convention on Human Rights, arts. 9–10; Human Rights Act 1998.
4. H. L. A. Hart, The Concept of Law, 3rd ed. (Oxford: Oxford University Press, 2012), especially chs. 7–9.
5. David Wootton, Bad Medicine: Doctors Doing Harm Since Hippocrates (Oxford: Oxford University Press, 2006).
6. Tom Bingham, The Rule of Law (London: Allen Lane, 2010), ch. 3.
7. Serious Crime Act 2015, s. 76 (controlling or coercive behaviour); Protection from Harassment Act 1997; Fraud Act 2006; Children and Young Persons Act 1933.
8. UK Government, Government pushes forward with conversion practices ban to protect LGBT+ people from abuse, 25 June 2026; Draft Conversion Practices Bill and Explanatory Notes (June 2026); HC Deb, 25 June 2026.
9. This reassessment is examined in Part II through the Cass Review, NHS England reforms, the closure of the Tavistock Gender Identity Development Service and the WellBN investigation.
10. See, e.g., NHS England guidance in force before the Cass Review; professional guidance issued by the former Gender Identity Development Service; Department for Education guidance and local authority policies on social transition (various editions).
11. See Hilary Cass, Independent Review of Gender Identity Services for Children and Young People: Final Report (London: NHS England, 2024), Executive Summary and Chapters 7–12.
12. NHS England, Independent Review of Gender Identity Services for Children and Young People (terms of reference and commissioning documents).
13. Cass, Final Report, especially Chapters 11–15; systematic evidence reviews commissioned by the Review.
14. Cass, Final Report, discussion of sexual orientation, adolescent development and clinical assessment; see also evidence reviews accompanying the Report.
15. Care Quality Commission, inspection reports concerning the Tavistock and Portman NHS Foundation Trust; NHS England, Implementing the Cass Review Recommendations (2024–2026); NHS England, plans establishing regional Children’s and Young People’s Gender Services.
16. NHS England, policy on puberty blockers following the Cass Review; UK Government announcement confirming the indefinite restriction of routine puberty blocker prescribing; Swedish National Board of Health and Welfare (Socialstyrelsen), Finnish Council for Choices in Health Care (COHERE Finland), and the Norwegian Healthcare Investigation Board (Ukom), together with related national clinical guidance.
17. Independent Investigation into WellBN Gender Services (2026); NHS Sussex and NHS England correspondence and implementation documents arising from the investigation.
18. Cass, Final Report; evidence cited therein concerning adolescent development, same-sex attraction and clinical uncertainty; see also testimonies of detransitioners where relied upon by the Review and subsequent parliamentary evidence.
19. Cass, Final Report; House of Commons Library, Hormone Treatments for Children and Young People (2026); evidence submitted to the Cass Review concerning detransition and adolescent sexual development.
20. Forstater v CGD Europe [2021] UKEAT 0105_20_1006; Equality Act 2010; see also subsequent case law on protected philosophical belief and sex-based rights, including For Women Scotland Ltd v The Scottish Ministers [2025] UKSC 16 where relevant to legal recognition of biological sex.
21. Jerome Lloyd, Concerning the Minister’s Consultation Response (2023); Jerome Lloyd, An Open Letter to Prime Minister Sir Keir Starmer on Labour’s Proposed Trans-Inclusive Conversion Therapy Ban (2024); Jerome Lloyd, Erased for Believing: What the Smith Judgment Means for Me (2025).
22. European Convention on Human Rights, arts. 9–10; Human Rights Act 1998.
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