This document discusses the doctrine of substantive ultra vires in administrative law. It begins by defining substantive ultra vires as when an authority exercises powers beyond what is conferred by law. The document then discusses several key aspects of substantive ultra vires, including:
- The limits of statutory powers and how an authority's actions must fall within the powers granted by statute.
- The use of ouster clauses by Parliament to restrict judicial review, and how courts narrowly interpret such clauses.
- What constitutes an error of law, and when a decision can be quashed for being ultra vires.
- The need for authorities to properly direct their discretion and not act arbitrarily when statutes provide discretionary powers.