Not every unlawful Home Office decision can be fixed with a standard appeal. When there's no right of appeal available, or the problem lies in how a decision was reached rather than what it decided, judicial review can be the only realistic route to a remedy.
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What is judicial review?
Judicial review is the process by which the High Court examines the lawfulness of a decision made by a public body, such as the Home Office. Crucially, it is not an appeal on the merits — the court does not simply substitute its own view of what the right outcome should have been. Instead, it examines whether the decision was made lawfully, rationally, and with procedural fairness. If a decision is found unlawful, the usual outcome is that it's sent back to the decision-maker to be made again properly — not that the court decides the substantive outcome itself.
When it's used in immigration cases
Judicial review is typically the appropriate route where there's no statutory right of appeal available for the decision in question, or where the challenge is genuinely about the legality of the process rather than a disagreement over the facts — for example, unreasonable and unexplained delay in deciding a case, a decision made without giving the person a fair opportunity to respond, or a decision that fails to properly apply the Home Office's own published policy.
Where a statutory right of appeal exists and hasn't been exhausted, the courts will generally expect that route to be used instead of judicial review. Bringing judicial review when an appeal was actually the right route can lead to the claim being refused permission to proceed.
The pre-action protocol
Before formally issuing judicial review proceedings, a pre-action protocol letter must generally be sent to the relevant public body, clearly setting out the grounds of challenge and giving it a genuine opportunity to respond, reconsider, or resolve the issue before court proceedings begin. Many potential judicial review cases are resolved at this stage without ever reaching a formal court hearing, which can save significant time and cost.
Strict time limits
Judicial review claims must be brought promptly, and in any event within three months of the decision being challenged — a considerably shorter window than many people expect, and one the courts apply strictly. Acting quickly once a potential ground for challenge is identified is essential; delay can be fatal to an otherwise strong case.
What judicial review can achieve
Available remedies include quashing the unlawful decision (sending it back to be remade properly), a mandatory order requiring the public body to take a specific action (such as making a decision it has unreasonably delayed), and, in urgent cases such as an imminent removal, an interim injunction to pause action while the underlying challenge is resolved. Because outcomes are generally procedural rather than a guaranteed substantive win, it's important to have realistic expectations about what judicial review can and can't deliver.