ChD 30 July 1987. An originating summons by which tenants (P) sought a determination of the construction of the rent review provisions in a lease. At issue was the meaning of the construction of a provision which stated that if a rent review was not completed within 12 months of the commencement of a relevant period, the rent payable during that period would be the current rent increased by 25%. It was argued by P that as the review had not been completed in time, the automatic increase of 25% in the current rent came into effect. The landlords contended that this 25% provision was only an interim arrangement, and therefore, if a rent review was to be subsequently completed, the revised rent would take effect if it resulted in a figure over 125% of the rent payable for the previous period. On appeal, it was held that the increase of 25% did not operate automatically if the review was not completed within 12 months of the completion of the relevant period.