14E+WThe grounds on which an agreement or determination may be varied on an application under the last foregoing paragraph are the following:—
(a)that the expenditure reasonably incurred by the landlord in carrying out the relevant initial repairs substantially exceeded the estimated cost thereof; or
(b)that the applicant is not the person who was the tenant at the time of the previous agreement or determination and that there are considerations arising out of the personal circumstances of the applicant which ought to be taken into account in determining the manner of making the payment.