ON 19 NOVEMBER 1982, the NSW Court of Appeal delivered Metropolitan Water Sewerage and Drainage Board v Histon  2 NSWLR 720.
Per Hutley JA at 722:
“Though not every allowance is part of a salary, for example, a travelling allowance, it seems to me that an allowance for a skill which the employee possesses which gives him a differential over other who might be employed in the office is part of the salary paid to him in relation to the office held by him. If this is the correct interpretation of the works of s21(1)(f), the decision of the tribunal was wrong and it had no jurisdiction.”
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