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Why may a UK court decide an action is illegal?

Reasons why the courts may decide the decision or action is illegal include:-

        The ultra vires principle. The public body did not have the powers under legislation to take the decision or carry out the action.

        The person who took the decision did not have the authority within the organisation to do so.

        The decision relied on incorrect facts

        The Wednesbury principle.  Public bodies should come to decisions that are reasonable in terms of basic logic and moral standards

        The public body took into account irrelevant factors in coming to the decision or did not take into account relevant factors

        There was no right to a fair hearing by the person affected

        The decision is in breach of Human Rights Law or EU law

* In light of the transition period and exit of the UK from the European Union, the information relating to UK courts and EU law is subject to change.