Question

What is judicial review?

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Judicial review is a court process examining whether a decision by a public body was made lawfully. It is one of the main mechanisms by which government and public authorities are held to account in the UK.

The critical distinction: it reviews the process, not the merits. A court conducting judicial review is not asking whether the decision was correct, wise or fair in outcome. It asks whether the decision-maker acted within their legal powers and followed a lawful process. A decision can be foolish and lawful, and the court will not interfere.

This is frequently misunderstood in reporting, where a successful judicial review is described as a court disagreeing with a policy. The court is almost always saying the decision was reached improperly, and the body remains free to make the same decision again having followed a proper process.

The main grounds:

Illegality — acting beyond legal powers (ultra vires), misdirecting oneself in law, or using a power for an improper purpose.

Irrationality — the Wednesbury standard, meaning a decision so unreasonable that no reasonable authority could have reached it. A deliberately very high bar.

Procedural impropriety — failing to follow a required procedure, failing to consult where required, breaching natural justice, bias, or failing to give reasons where obliged to.

Legitimate expectation — departing from a clear promise or established practice without justification.

Human rights grounds under the Human Rights Act.

Practical points: claims must be brought promptly and generally within three months; the claimant must have standing — a sufficient interest; permission is required before a full hearing; and it is a remedy of last resort, so other routes such as an internal appeal or ombudsman must usually be exhausted first.

Remedies include quashing the decision, prohibiting an action, or a declaration — rarely damages.

This describes England and Wales.

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