11. Grounds for Judicial Review: Illegality

  • Judicial review is based on technical grounds.

Ultra Vires Jurisdictional and Non-Jurisdictional Error
  • The ultra vires doctrine states that a public body must not go beyond its power.
  • It applies where the court has to decide if a public body has misinterpreted or abused its statutory powers.
  • A jurisdictional error is a mistake of law which takes a public body outside the powers it has been given to enquire into matters and make decisions. The court can review all the vital findings on which the existence of a public body’s jurisdiction depends, including findings of facts. Any misinterpretation or abuse of power made by a public body is capable of being a jurisdictional error. Practical examples are acting in bad faith; failing to comply with the rules of natural justice; taking into account irrelevant considerations or failing to take into account any relevant matters.
  • A non-jurisdictional error of law exists if there is an error of law and the error of law must be on the face of the record of the decision.

Improper Purpose
  • A public body must exercise a discretionary power for the purpose for which it is granted.
  • If a statute states the purposes for which discretion is to be exercised, the courts will treat the stated purposes as exhaustive and will be ultra vires.

Relevant and Irrelevant Considerations
  • A public body must take into account relevant matters and discard anything irrelevant.
  • Where the relevant considerations are expressedly stated in a statute any deviation will make a decision invalid.

Lack of Evidence
  • A public body must base its conclusions of fact on the evidence before it.
  • A public body’s decision can be challenged by judicial review on the ground that it has ignored relevant evidence, or misinterpreted evidence or has unreasonably made a decision which is contrary to the weight of the evidence presented to it during the decision-making process.

Unlawful Failure to Exercise a Discretionary Power
  • When a public body is given a discretionary power it is entitled to formulate and adopt a policy governing its decision-making process, but it cannot adopt a policy which prevents it exercising its discretion by shutting its ears to a certain type of application. It must be prepared to consider every application on its merits and consider whether there are any special circumstances justifying departure from its usual policy.


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Madzimbamuto v Lardner-Burke [1969] AC 645

According to the Terrorism and Immigration Act 2018, all recent refugees arriving in the UK seeking asylum are to be kept detained until their claims are processed and it can be ascertained that they do not pose a terrorist threat. The local detention centres are run by a private firm, ‘Home Away from Home.’ Estela, a recently arrived asylum seeker has been detained in one of the privately run facilities, and has had her room searched regularly by ‘Home Away from Home’ private security guards in case she has any contraband in her possession. As she has to wait outside while they are searching her room, Estela fears that the security guards may go through her private correspondence whilst searching. Advise Estela on any claims she may make on the grounds of the HRA 1998, including reference to any procedural requirements. [Note: This is a hypothetical scenario and the Terrorism and Immigration Act 2018 is not real legislation.]