“(l) To set aside (which setting aside shall for the purposes of the Fifth Schedule hereto be deemed to be an item of expenditure of the Lessor) in a bank or building society trust account earning interest such sums of money as the Lessor shall reasonably expect to incur of replacing maintaining and renewing those items which the Lessor has hereby covenanted to replace maintain or renew and which are not normal annual expenditure”
“(1) Relevant costs shall be taken into account in determining the amount of a service charge payable for a period— (a) only to the extent that they are reasonably incurred, and (b) where they are incurred on the provision of services or the carrying out of works, only if the services or works are of a reasonable standard; and the amount payable shall be limited accordingly. (2) Where a service charge is payable before the relevant costs are incurred, no greater amount than is reasonable is so payable, and after the relevant costs have been incurred any necessary adjustment shall be made by repayment, reduction or subsequent charges or otherwise. . . .”