Where a superannuation trust deed defines 'Total and Permanent Invalidity' with an exclusion for 'deliberate action or inaction for the purpose of causing a benefit to be payable, including without limitation what the Trustee considers to be an unreasonable refusal to submit to treatment', the unreasonable refusal to submit to treatment is a standalone ground of exclusion and need not be shown to have been for the improper purpose of securing a benefit. The Karger v Paul duties (good faith, real and genuine consideration, proper purpose) apply to a trustee's obligation to form an opinion on a question of fact bearing on entitlement, but work out differently in practice from the exercise of a discretionary power. A court may infer breach of duty if the decision is one no reasonable trustee could make on the material before it. The question whether additional administrative law-style grounds of review apply to such decisions was left open.
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