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31.—(1) Subject to paragraphs (3) and (4), this Article applies to any of the following instruments executed on or after the appointed day, that is to say—
(a)a fee farm grant;
(b)a lease of a dwelling-house originally granted for a term of more than 50 years;
(c)an agreement collateral to any instrument mentioned in sub-paragraph (a) or (b).
(2) Any provision of an instrument to which this Article applies for the increase or review of a ground rent on one or more than one occasion is of no effect.
(3) Nothing in this Article affects section 18(3) of the Act of 1971 (which allows the rent fixed on the extension of a lease under that Act to be made subject to revision).
(4) This Article does not apply to a building lease or to a fee farm grant for purposes corresponding to those of a building lease merely because provision is made for increases in the ground rent which are related to periods or events in the progress of building or related activities.