Where a share purchase agreement prescribes a hierarchy of accounting principles for preparation of completion accounts, clause 1.1(c)-type provisions referring to 'principles, policies and procedures used to prepare the trial balance' require application of those actually used, not those that should have been used. An expert engaged to determine disputes under such a clause who finds a consistent historical treatment under one level of the hierarchy but then applies a different policy from another level has departed from the contractual task, rendering that part of the determination invalid. However, whether a particular factual matter constitutes a 'principle, policy or procedure' is a question of fact for the expert, and error on that point does not invalidate the determination.
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