Decisions of the Financial Ombudsman Service are not susceptible to judicial review under the Datafin principle because FOS's power derives from contract and it does not exercise government functions. A tripartite contract arises between complainant, member and FOS upon lodging a complaint, but where the terms of reference provide that a Panel Chair's decision is 'final', only errors equivalent to jurisdictional error (fraud, dishonesty, lack of good faith, or failure to carry out the determination in accordance with the agreement) are reviewable — ordinary errors of law in the exercise of jurisdiction are not. The question whether the Datafin principle forms part of Australian law remains open.
The full text is available to signed-in members, including the 34 later cases that cite this judgment.
5 of the 34 citing cases carry a classified treatment. How each court treated it is available to signed-in members.