A retail shop lease is taken to include provision to the following effect--
(a) There is to be an adjustment between the lessor and the lessee for each accounting period of the lessor to take account of any under-payment or over-payment by the lessee in respect of outgoings during the period. The adjustment is to take place within 1 month after the lessor gives the lessee the outgoings statement referred to in section 28 for the period concerned and must in any event take place within 4 months after the end of that period.
(b) The adjustment is to be calculated on the basis of the difference between the total amount of outgoings in respect of which the lessee contributed (that is, the estimated total expenditure by the lessor on outgoings during the period concerned) and the total amount actually expended by the lessor in respect of those outgoings during that period, but taking into account only expenditure properly and reasonably incurred by the lessor in payment of those outgoings.
(c) Contribution by the lessee towards, and expenditure by the lessor in respect of, repairs and maintenance is not to be taken into account for the purposes of the adjustment to the extent that the contribution is, and the expenditure is in respect of, contributions required to be paid into a sinking fund as referred to in section 25.