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If the amount of the compensation which would have been payable under section thirty-seven of this Act if the tenancy had come to an end in circumstances giving rise to compensation under that section and the date at which the acquiring authority obtained possession had been the termination of the current tenancy exceeds the amount of the compensation payable under section 121 of the Lands Clauses Consolidation Act 1845 or section 20 of the Compulsory Purchase Act 1965 in the case of a tenancy to which this Part of this Act applies, that compensation shall be increased by the amount of the excess.
Nothing in section twenty-four of this Act shall affect the operation of the said section one hundred and twenty-one.