Taxation of Chargeable Gains Act 1992

11 (1) The current use value of an interest in land which is either—

(a) a freehold interest which is subject to a lease or an agreement for a lease, or

(b) an interest under a lease or agreement for a lease,

shall be ascertained without regard to any premium required under the lease or agreement for a lease or any sublease, or otherwise under the terms subject to which the lease or sublease was or is to be granted, but with regard to all other rights under the lease or prospective lease (and, for the current use value of an interest under a lease subject to a sublease, under the sublease).

(2) If under sub-paragraph (1) above an interest under a lease or agreement for a lease would have a negative value, the current use value of the interest shall be nil.

(3) If a lease is granted out of any interest in land after 17th December 1973, then, in computing any gain accruing on any disposal of the reversion on the lease made while the lease subsists, the current use value of the reversion at any time after the grant of the lease shall not exceed what would have been at that time the current use value of the interest in the land of the person then owning the reversion if that interest had not been subject to the lease.

(4) In the application of this paragraph to Scotland, “freehold” means the estate or interest of the proprietor of the dominium utile or, in the case of property other than feudal property, of the owner, and “reversion” means the interest of the landlord in property subject to a lease.