Judicial Review in England and Wales: Challenging a Public Body's Decision
By the BenchEvery working day, public bodies in England and Wales make decisions that reorder private lives. A council refuses planning permission or withdraws a service; a licensing committee revokes the licence a small business depends on; a department rejects a tender or a grant application; a regulator censures a professional. Most people on the receiving end assume the decision is final. Sometimes it is merely wrong — and the law will leave it standing. But where the decision was reached unlawfully, the High Court can strike it down. That supervisory power is judicial review: the mechanism by which the courts keep every exercise of public power inside the boundaries Parliament and the common law have set.
It is also one of the most misunderstood remedies in English civil law. Judicial review is not an appeal. It runs on some of the shortest deadlines in civil litigation, passes through a permission filter that rejects a large share of claims, and carries real costs risk. Used well — often as leverage rather than a fight to the death — it is a genuine discipline on official decision-making. Used naively, it is an expensive way to be given the same decision twice.
This guide explains what judicial review can and cannot do, who can bring a claim and against whom, the grounds, the unforgiving timetable, the permission stage, remedies, costs, and — most importantly — what winning actually gets you.
Lawfulness, not merits: the rule that explains everything else
The foundation of judicial review is a single distinction. The court reviews the lawfulness of a decision, not its merits. The judge does not ask whether the decision was right, wise or fair in the everyday sense, and will not substitute the decision the court itself would have made. The question is narrower: did the body have the power to decide this, and did it exercise that power in a legally proper way?
Two consequences follow, and both matter enormously to anyone weighing a claim. First, a harsh or unpopular decision that was lawfully made will survive review, however strongly you disagree with it. Second, even a successful challenge does not usually reverse the decision — it sends the decision back to be taken again, lawfully this time. A public body that follows a fair process and directs itself correctly on the law may, on the retake, reach exactly the same conclusion. Judicial review polices the route, not the destination.
Who can bring a claim — and against whom
The claimant must have what section 31 of the Senior Courts Act 1981 calls a sufficient interest in the matter. In practice the courts take a generous view. Anyone directly affected by the decision — the applicant refused, the licence-holder revoked, the resident whose service is cut — plainly qualifies. Representative bodies and campaign groups have also been granted standing where the issue is serious, the group is credible and there is no better-placed challenger. Standing is rarely the battleground in an ordinary case; timing and the merits of the grounds are.
The defendant must be a public body, or a private body exercising a public function. Ministers, government departments, local authorities, regulators, NHS bodies and many tribunals are the obvious candidates. But ever since R v Panel on Take-overs and Mergers, ex parte Datafin plc [1987] QB 815, the courts have looked at the nature of the function rather than only the source of the power: a nominally private body woven into a scheme of public regulation can be amenable to review. The converse trap catches many would-be claimants: disputes that are really contractual — an employment grievance against a council, a commercial disagreement with a public body acting as an ordinary contracting party — belong in private law, not judicial review.
The grounds: what makes a decision unlawful
The classic taxonomy comes from Council of Civil Service Unions v Minister for the Civil Service [1985] AC 374 — the GCHQ case — which grouped the grounds into illegality, irrationality and procedural impropriety. Legitimate expectation has since matured into a ground of its own, and proportionality does distinct work in human-rights cases.
Illegality
The body misunderstood or misapplied the law that empowers it. This includes acting beyond its statutory powers altogether, misdirecting itself on what a statute means, taking into account considerations the law says are irrelevant, ignoring considerations the law says are mandatory, using a power for an improper purpose, fettering its own discretion with a rigid blanket policy, or letting the wrong person take the decision. Illegality is the workhorse ground: a large share of successful reviews involve some version of it.
Irrationality
A decision so unreasonable that no reasonable authority could have reached it — the standard associated with Associated Provincial Picture Houses Ltd v Wednesbury Corporation [1948] 1 KB 223. The bar is deliberately high, because a low one would let judges retake merits decisions under another name. Pleading irrationality alone, without more, is usually a sign of a weak claim; it works best where the decision defies logic on its own stated reasoning or rests on a demonstrable misunderstanding of the facts.
Procedural unfairness
The decision was reached by an unfair process: the person affected was not told the case against them or given a fair chance to respond; a consultation was promised or required and not properly carried out; the decision-maker was biased, or appeared to be; reasons were legally required and not given. Process grounds are often the easiest to prove — the record either shows a fair procedure or it does not — but remember the limit of the remedy: cure the unfairness, and the same decision may lawfully follow.
Legitimate expectation
Where a public body has made a clear and unequivocal promise, or followed a settled practice, those affected may have a legitimate expectation that it will be honoured. Usually the expectation is procedural — you will be consulted before the policy changes. Rarely, courts protect a substantive expectation of the benefit itself, where resiling would be so unfair as to amount to an abuse of power. The promise must be clear; hopeful readings of ambiguous statements do not found the ground.
Proportionality and human rights
Where the decision interferes with a right protected by the Human Rights Act 1998, the court asks a more searching question: whether the interference pursued a legitimate aim and was proportionate to it. That is a more intensive standard than Wednesbury unreasonableness, and it can require the court to weigh the balance struck. Outside the human-rights context, proportionality has not (yet) displaced the ordinary common-law grounds. If your complaint engages a Convention right — home, family life, expression, property — say so in the grounds; it changes the intensity of review.
The clock: promptly, and in any event within three months
Here is where more claims die than anywhere else. A judicial review claim must be filed promptly, and in any event not later than three months after the grounds first arose — normally the date of the decision. Three months is a ceiling, not an allowance: a claim filed within the period can still be refused for want of promptness where delay has caused prejudice. The parties cannot agree to extend time between themselves. The court has a discretion to extend for good reason, but nobody should plan on receiving it.
Two regimes are tighter still: challenges to decisions under the planning Acts must be brought within six weeks, and public procurement challenges within 30 days. If your dispute is anywhere near those fields, treat the timetable as measured in days, not months. The practical rule for everyone: the moment you suspect a public decision is unlawful, get the pre-action letter moving. Waiting for an internal complaints process to grind through does not stop the clock.
Before you file: the protocol letter and the last-resort rule
Judicial review has its own pre-action protocol. The claimant sends a letter before claim identifying the decision, the grounds of challenge and the remedy sought, and the public body normally has 14 days to respond. This is not an empty formality. A significant share of disputes end here — decisions are withdrawn, retaken or explained in a way that dissolves the challenge — because a public body's lawyers, confronted with an arguable ground and a costs risk, will often advise a retake rather than a defence. The letter differs in purpose from an ordinary civil letter before action, but the same disciplines apply: precision, restraint and a clear deadline.
Judicial review is also a remedy of last resort. If Parliament has provided a statutory appeal, or an ombudsman, internal review or complaints route can give you what you need, the court will expect you to use it — and can refuse permission because an adequate alternative remedy exists. Many refusals carry a statutory appeal route that is cheaper and reviews the merits, which judicial review never will; checking for one is not an optional preliminary.
Permission: the filter most claims must pass
You cannot simply issue a judicial review and proceed to trial. The claim is filed in the Administrative Court with the grounds and evidence, a modest issue fee is payable, and the defendant has 21 days to file an acknowledgment of service with summary grounds of resistance. A judge then decides — usually on the papers — whether the claim is arguable. If permission is refused on the papers, the claimant can normally renew the application to a short oral hearing; a claim certified as totally without merit loses that right. If permission is granted, a further fee is payable and the case proceeds to a substantive hearing, typically decided on documents and written evidence rather than live witnesses.
One statutory filter deserves special mention: under section 31 of the Senior Courts Act 1981, the court must refuse permission or relief where it appears highly likely that the outcome for the claimant would not have been substantially different even without the unlawfulness complained of, unless the court considers there are reasons of exceptional public interest to let the claim proceed. A technical procedural slip that changed nothing will rarely sustain a claim.
Interim relief
Where the decision will cause irreversible harm before any hearing — a demolition, a removal, a contract signed with a rival bidder — the court can grant interim relief: an injunction or a stay holding the position until the claim is decided. Urgent applications can be made at speed, in truly pressing cases within hours. Interim relief is discretionary and may come with conditions, but it is the difference between a live challenge and a historical grievance.
Remedies: what winning actually gets you
The court's remedial toolkit is distinctive. A quashing order sets the decision aside; a mandatory order compels the body to perform a duty; a prohibiting order restrains it from acting unlawfully; a declaration states the legal position; an injunction may support any of them. Damages are the exception, not the rule: the court can award them only where a recognised private-law claim or a Human Rights Act claim runs alongside the review. Unlawfulness alone, without such a claim, sounds in no compensation.
The Judicial Review and Courts Act 2022 added flexibility at the remedial stage: the court may now suspend the effect of a quashing order to a future date, or limit or remove its retrospective effect, so that an unlawful measure can be unwound in an orderly way rather than instantly and for all purposes. The same Act also shut down, in all but exceptional circumstances, judicial review of the Upper Tribunal's refusals of permission to appeal, closing off a once-common route.
Hold on to the central expectation-setting point: a quashing order returns the decision to the decision-maker. If the flaw was procedural, the body can run a fair process and decide the same way. The real-world value of winning is often the second look itself — a fresh decision, properly reasoned, taken in the knowledge that the court is watching — and the negotiating position the judgment creates.
Costs: the risk that shapes every choice
The ordinary rule is loser pays. Lose at a substantive hearing and you will usually be ordered to pay the defendant's costs, which in a fully fought review can be substantial; our guide to costs orders explains the machinery. The permission stage moderates the risk: a claimant refused permission on the papers is normally liable only for the defendant's costs of preparing the acknowledgment of service, not the full costs of a defence.
Two protective regimes exist. Environmental claims within the scope of the Aarhus Convention benefit from default caps on the claimant's costs liability, with a reciprocal cap on what a successful claimant can recover. Outside the environmental field, the court can make a judicial review costs capping order under the Criminal Justice and Courts Act 2015 — but only after permission has been granted, and only in genuine public interest cases where the claimant would otherwise reasonably abandon the claim. For everyone else, costs exposure is a live strategic factor from the first letter, and it is one reason so many challenges resolve at the pre-action stage.
How these cases actually end
Be realistic about the arc. Many potential claims are resolved by a well-aimed protocol letter. Of the claims actually filed, a majority do not survive permission. Of those that do, a good number settle by consent order — the body agrees to retake the decision — because once a judge has found the grounds arguable, the defendant's appetite for a hearing often fades. Fully fought substantive hearings, won outright by claimants, are the minority end of the funnel.
None of that makes judicial review a bad tool. It makes it a precise one. It suits the claimant who can identify a concrete legal flaw — a misread statute, a broken promise, a consultation that never happened — move within days or weeks, and accept that the prize is a lawful second decision rather than a guaranteed different one. It does not suit the claimant whose real complaint is that the decision was harsh, or who needs compensation, or who has an unexhausted appeal route sitting in the refusal letter. Self-represented claimants do bring judicial reviews, but the compressed timetable and costs risk make early, honest triage essential — our guide to representing yourself in court covers the general discipline.
If you are staring at a public body's decision and wondering whether it crosses the line from wrong to unlawful, the questions to answer are always the same: what power was being exercised, what does the empowering statute actually say, what process was promised or required, and how many days remain on the clock. Ask CommonBench's Legal Chat to test your grounds against the authorities and map the deadlines that apply to your decision.
This article is published by CommonBench for informational purposes only and does not constitute legal advice. If you are weighing a challenge to a public body's decision and need to test the grounds, the deadlines and the alternatives against your own facts before the clock runs out, try CommonBench — AI-powered legal research with verified citations across five common law jurisdictions.