s 15 Right to lodge
(1) Subject to subsection (3), a person may lodge a caution against the registration of title to an unregistered legal estate if he claims to be— (a) the owner of a qualifying estate, or (b) entitled to an interest affecting a qualifying estate. (2) For the purposes of subsection (1), a qualifying estate is a legal estate which— (a) relates to land to which the caution relates, and (b) is an interest of any of the following kinds— (i) an estate in land, (ii) a rentcharge, (iii) a franchise, and (iv) a profit a prendre in gross. (3) No caution may be lodged under subsection (1)— (a) in the case of paragraph (a), by virtue of ownership of— (i) a freehold estate in land, or (ii) a leasehold estate in land granted for a term of which more than seven years are unexpired; (b) in the case of paragraph (b), by virtue of entitlement to such a leasehold estate as is mentioned in paragraph (a)(ii) of this subsection. (4) The right under subsection (1) is exercisable by application to the registrar.