Authored By: Arshiya Alji
Middlesex University Dubai
Case citation and basic information
Full Case Name: Re A (Children) (Conjoined Twins: Surgical Separation)
Citation: [2000] EWCA Civ 254; [2001] Fam 147
Court: Court Of Appeal (Civil Division), England and Wales
Date of Decision: 22 September 2000
Bench Composition: Ward LJ, Brooke LJ, Walker LJ
Areas of Law: Medical Law, Criminal Law, Family Law, Human Rights, Ethics
Introduction
There are cases that test the limits of legal reasoning, and there are cases that test the limits of human morality. Re A (Children) (Conjoined Twins: Surgical Separation) [2000] did both simultaneously.[1] In September 2000, the Court of Appeal of England and Wales was asked to determine whether doctors could lawfully perform an operation that would save one child’s life by inevitably causing the death of another. The children were conjoined twins. Their parents, who were devout Roman Catholics, refused consent on religious grounds. Three judges of the Court of Appeal each reached the same conclusion through entirely different legal pathways. The case remains the most significant decision in English medical law to grapple simultaneously with criminal liability, parental autonomy, the best interests of the child, and the right to life under the European Convention on Human Rights (ECHR). Its legacy lies in what it reveals about the outer limits of legal reasoning when confronted with a genuine moral tragedy.
Facts of the case
Jodie and Mary – names assigned by the court to protect their identities – were conjoined twins born in August 2000 to Roman Catholic parents from Gozo, Malta. The twins were joined at the lower abdomen and shared a common aorta. Jodie was the stronger twin, possessing a functioning heart, lungs, and brain. Mary was severely underdeveloped and lacked any independent cardiopulmonary function. She survived entirely because Jodie’s heart was pumping oxygenated blood through both their bodies.
Medical evidence established two critical points. Without separation, both twins would die within three to six months. Jodie’s heart could not indefinitely sustain two bodies. With separation, Jodie had a reasonable prospect of survival, but Mary would die almost immediately, as she possessed no independent capacity to sustain life.
The twins’ parents refused consent. Acting in accordance with their Roman Catholic faith, they maintained that neither medicine nor the courts had the authority to determine which child should live. They believed God had given both children life and only God should determine its end. Before Johnson J, the parents further submitted that authorising the surgery would sanction the deliberate killing of an innocent child, which no court had the moral or legal authority to permit.
The NHS Trust applied to the Family Division of the High Court for a declaration that the proposed surgery would be lawful notwithstanding the parents’ refusal. Johnson J granted the declaration, concluding that the operation was in the best interests of both children considered individually and that Jodie’s right to life could not be extinguished by the parental refusal alone. The parents appealed to the Court of Appeal.
Legal issues
The Court addressed the following questions of law:
Whether the surgical separation of the twins constituted the criminal offence of murder in respect of Mary, given that her death would be the inevitable consequence of the operation?
Whether the doctrine of necessity could provide a lawful defence to what would otherwise constitute an unlawful killing?
iii. Whether the court had jurisdiction to override parents acting in good faith and in accordance with their religious convictions in respect of their children’s medical treatment?
Arguments presented
5.1 Appellant’s Argument – The Parents
The parents contended that no court possessed the authority to sanction the deliberate killing of an innocent child regardless of their medical circumstances. They submitted that Mary held an equal and inalienable right to life under Article 2 of the ECHR, a right that could not be extinguished merely because her existence was harmful to her sister.[2] Relying on R v Howe [1987], they argued that necessity had never justified the intentional killing of an innocent person and ought not to be extended here.[3] As the twins’ parents, they bore primary legal and moral responsibility for decisions concerning their children’s medical treatment – a responsibility ought to be respected by the court. Their refusal was not irrational but grounded in a sincerely held ethical and religious framework.
5.2 Respondent’s Argument – The NHS Trust
The NHS Trust submitted that surgical separation was in the best interests of both children, assessed individually. For Jodie, it was her only prospect of survival. For Mary, whose death was medically inevitable regardless of the decision, separation would give meaning to her brief life by preserving her sister. Relying on the Children Act 1989 and Re B (A Minor) (Wardship: Medical Treatment) [1981], the Trust argued that the court was both empowered and obliged to intervene where a child’s welfare required it, even against parental wishes.[4][5] The doctrine of necessity, developed in subsequent case law, provided a complete defence to any criminal liability. Drawing upon Airedale NHS Trust v Bland [1993], the Trust submitted that the best interests principle was flexible enough to accommodate decisions where death was the outcome, provided it represented the least harmful course of action available.[6]
Court’s reasoning and analysis
The Court of Appeal unanimously dismissed the appeal, yet each judge reasoned differently.
Ward LJ approached the matter principally through the best interests of each child and the doctrine of necessity. He acknowledged without reservation that the surgery would cause Mary’s death and rejected the submission that her death was a mere side effect. He concluded that the operation was nonetheless lawful. Balancing the rights of the two children under Article 2 of the ECHR, he determined that Jodie’s right to life had to take precedence.[7] Controversially, Ward LJ characterised Mary as, in a technical legal sense, an unjust aggressor – not morally culpable, but physically threatening Jodie’s survival by draining her of life. This reasoning attracted substantial academic criticism, as it applied a concept ordinarily reserved for those who act threateningly to an entirely innocent infant, whose sole act was existing. The parents’ argument that Mary’s right to life was absolute was rejected – it could not be reconciled with Jodie’s equal and competing right to survival.
Brooke LJ grounded his reasoning in a rigorous doctrinal analysis of the criminal law defence of necessity. He identified three conditions that must be satisfied for necessity to operate as a defence: the act must be needed to avoid inevitable and irreparable evil; no more must be done than is reasonably necessary; and the evil inflicted must not be disproportionate to the evil avoided. All three conditions were satisfied. Mary’s death, though certain, was proportional to preserving Jodie’s life, as Mary faced inevitable death regardless. Brooke LJ accepted the Trust’s argument and rejected the parents’ contention that necessity could never justify killing. His judgement is the most widely cited of the three in subsequent academic and judicial discourse.
Walker LJ adopted the narrowest approach. He preferred to resolve the matter on the best interests grounds without fully engaging the criminal law dimension. He concluded that continued life in Mary’s condition – entirely dependent upon her sister, with no prospect of independent survival – was not in Mary’s best interest. The operation, though fatal to Mary, was therefore in her best interest as it brought to an end a condition that could not be sustained. Walker LJ deliberately refrained from establishing any broad principle regarding the necessity defence, confining his reasoning to the specific circumstance before the court.
Judgement and Ratio Decidendi
The Court of Appeal dismissed the parents’ appeal and upheld the earlier declaration permitting surgical separation. The operation was subsequently carried out. Jodie survived. Mary died during the procedure, consistent with what the medical evidence had indicated from the outset.
7.1 Ratio Decidendi
Where conjoined twins share vital organs and surgical separation is the only way to save one twin’s life, a court may authorise the operation even where the parents have refused consent. This is so long as the weaker twin’s death is medically inevitable regardless of what decision is made, and the harm prevented by operating is substantially greater than the harm caused. In carefully limited circumstances, the doctrine of necessity may provide a lawful defence to what would otherwise amount to an unlawful killing.
7.2 Obiter Dicta
All three judges were clear that the decision applied narrowly and only to the specific unique facts of the case. Ward LJ cautioned expressly that it should not be taken as authority for any wider principle about taking an innocent life. No general rule permitting the weighing of one life against another was intended or created.
Critical analysis
8.1 Significance of the decision
Re A is the first case in English legal history to confront judicially authorised separation surgery involving conjoined twins. Its significance operates on several levels. Most notably, it established that courts may override parental refusal of medical treatment, even where it is grounded in sincere religious belief. It demonstrated judicial willingness to engage with profound ethical dilemmas. It contributed to the development of the necessity defence in English criminal law and influenced medical protocols for conjoined twins pregnancies. The decision affirmed that a child’s right to life cannot be subordinated to parental preference alone, bringing English medical law into closer alignment with the international human rights standards.
8.2 Implications and Impact
The decision reinforced the principle from Re B (A Minor) that courts will intervene to preserve a child’s life even where parents object, to circumstances of exceptional moral complexity. Courts have since approached Brooke LJ’s analysis of the necessity with considerable caution, declining to extend its reasoning beyond the specific facts of Re A. The case has been widely discussed in bioethics literature globally and has shaped clinical protocols in the United Kingdom and internationally. It raises unresolved questions about the relationship between law, religion, and parental authority – questions that remain relevant as medical technology advances.
8.3 Critical Evaluation
Strengths
All three judges acknowledged openly that no perfect answer existed, reflecting a rare intellectual honesty. Each engaged seriously with multiple legal frameworks, carefully balancing competing rights rather than defaulting to a single principle. The decision ultimately protected Jodie’s right to life and showed genuine judicial courage.
Weaknesses
Ward LJ’s characterisation of Mary as an unjust aggressor has attracted widespread academic criticism.[8] Mary was an innocent infant whose only act was existing – to describe her continued existence as a form of aggression distorts the concept well beyond recognition. Brooke LJ’s necessity analysis does not obviously confine itself to the unique facts of the case, leaving unanswered questions about where that principle ends. The parents’ religious perspective deserved deeper engagement – their position reflected a coherent ethical framework that the court addressed only briefly. An alternative approach was available – to resolve the matter entirely on best interest grounds, as Walker LJ preferred – thereby avoiding the more controversial necessity analysis altogether. The tension between law and religion in this context remains unaddressed.
Conclusion
Re A (Children) (Conjoined Twins: Surgical Separation) remains one of the most consequential decisions in English legal history. The Court of Appeal established that courts may authorise life-saving treatment over parental objection, that necessity may in exceptional circumstances defend an otherwise unlawful killing, and that the best interests of a child may encompass outcomes that involve that child’s death. Each principle carries enduring significance for medical law and child welfare law.
Beyond its legal contribution, the case demonstrates something profound – that legal systems are occasionally confronted with questions they cannot fully resolve, and that in those moments courts must make the most humane decision with the most far-reaching consequences.
Jodie – later reported to be named Gracie – survived the surgery and went on to live a full life. Mary was buried in Gozo. Their parents never fully accepted the decision. The questions the case raised about necessity, religious conviction, and judicial authority over life and death remain unresolved. As medical technology advances, Re A will remain the unavoidable starting point for any serious legal engagement with those questions.
References / Bibliography
Cases
Re A (Children) (Conjoined Twins: Surgical Separation) [2000] EWCA Civ 254.
Re B (A Minor) (Wardship: Medical Treatment) [1981] 1 WLR 1421.
R v Howe [1987] AC 417.
Airedale NHS Trust v Bland [1993] AC 789.
Legislation
Children Act 1989
Human Rights Act 1998
European Convention on Human Rights, Article 2
Secondary Sources
A Bainham, ‘Resolving the Unresolvable: The Case of the Conjoined Twins’ (2001) 60 Cambridge Law Journal 49
[1] Re A (Children) (Conjoined Twins: Surgical Separation) [2000] EWCA Civ 254.
[2] European Convention on Human Rights Article 2.
[3] R v Howe [1987] AC 417.
[4] Children Act 1989.
[5] Re B (A Minor) (Wardship: Medical Treatment) [1981] 1 WLR 1421.
[6] Airedale NHS Trust v Bland [1993] AC 789.
[7] Article 2 ECHR.
[8] A Bainham, ‘Resolving the Unresolvable: The Case of the Conjoined Twins’ (2001) 60 CLJ 49.
