Depreciation allocation for tonnage tax assets: apportioned written down value creates separate qualifying asset block for depreciation. Section 115VK requires apportioning the aggregate book written down value of the block of ships/inland vessels between qualifying and other assets on the first day of the first previous year in the ratio of their book written down values, creating a separate block of qualifying assets for depreciation; revaluations after the specified Finance Act assent date are ignored. Transfers of assets between blocks require proportionate transfers of written down value based on book values as on the first day of the previous year, and depreciation for a year of change is allocated in proportion to days of use for tonnage tax business and other purposes.