Legal Case Summary
F v West Berkshire Health Authority [1989] 2 AC 1
Declaration of legality, performing operation on patient incapable of giving consent
Facts
The case concerned a 36 year old woman who however had the mental age of a minor. The woman in question lived permanently at a mental hospital under medical care. Her mother sought a declaration from the court to the effect that it would be lawful to sterilize her daughter even though she is unable to consent to the operation due to her mental age. The need for the application was grounded in the fact that hospital staff (as well as the mother) suspected that the daughter may become pregnant as she had entered into a relationship with a patient in the hospital where she was staying. It was feared that going through pregnancy and the birth would have serious negative consequences for the daughter.
Issues
Several issues arose in this case, namely whether it was lawful for a doctor to perform such an operation on a patient who is mentally incapable of giving consent, whether the court has jurisdiction to make such a declaration of legality and whether such a declaration must be sought before such an operation can be performed.
Decision / Outcome
The court held that the operation was lawful as it was in the best interests of the daughter. It was held that this could be determined by reference to what is accepted at the time of the operation as the appropriate treatment, by a reasonable body of medical opinion skilled in the proposed treatment. Further, the court held that it is not necessary for a doctor to seek a declaration of legality before carrying out a sterilization in similar circumstances, but that a doctor should in practice seek such a declaration.
Updated 19 March 2026
This summary of F v West Berkshire Health Authority [1989] 2 AC 1 remains broadly accurate as a statement of the case and its immediate outcome. However, readers should be aware of two significant legal developments that have substantially affected the practical legal position since 1989.
First, the Mental Capacity Act 2005 (in force from October 2007) now provides the primary statutory framework governing decisions made on behalf of adults who lack capacity in England and Wales. The Act codifies and develops the best interests test, replacing the common law approach described in the article with a structured statutory framework. Section 1(5) and section 4 set out how best interests must be assessed, going considerably beyond the Bolam-style medical opinion standard approved in F v West Berkshire. The Act also established the Court of Protection with a dedicated jurisdiction over such matters.
Second, the requirement to seek a court declaration before performing an operation such as sterilisation on a person lacking capacity has been significantly strengthened. The Court of Protection’s Practice Direction 9E (and related guidance) makes clear that certain serious medical procedures — including non-therapeutic sterilisation — require court authorisation and should not proceed without it. This goes further than the House of Lords’ guidance in this case, which indicated that a declaration was not strictly legally necessary, though desirable in practice.
The case remains an important authority on the development of the common law best interests jurisdiction and the doctrine of necessity, but students should treat the procedural and substantive framework described in the article as superseded by the Mental Capacity Act 2005 for modern purposes.
