2If in any case the sum to be paid by virtue of the said section 12(1) to the tenant of an agricultural holding by an acquiring authority would, apart from this paragraph and paragraph 3 of this Schedule, fall to be ascertained in pursuance of section 9(2) of this Act by reference to the rent of the holding at a rate which was not determined by arbitration under section 7 or section 8, or by the Scottish Land Court in pursuance of section 78, of the principal Scottish Act and which the authority consider is unduly high, the authority may make an application to the Lands Tribunal for Scotland for the rent to be considered by the tribunal.