[7(1)This paragraph applies to determine the amount of rent payable under a lease where that amount—U.K.
(a)varies in accordance with provision in the lease, or
(b)is contingent, uncertain or unascertained.
(2)As regards rent payable in respect of any period before the end of the fifth year of the term of the lease—
(a)the provisions of this Part apply as in relation to other chargeable consideration, and
(b)the provisions of section 51 (1) and (2) accordingly apply if the amount is contingent, uncertain or unascertained.
(3)As regards rent payable in respect of any period after the end of the fifth year of the term of the lease, the annual amount is assumed for the purposes of this Part to be, in every case, equal to the highest amount of rent payable in respect of any consecutive twelve month period in the first five years of the term.
In determining that amount take into account (if necessary) any amounts determined as mentioned in sub-paragraph (2)(b), but disregard [paragraphs 9(2) and 9A(3) (deemed reduction of rent, where further lease granted, for period during which rents overlap)].
(4)This paragraph has effect subject to paragraph 8 (adjustment where rent payable ceases to be uncertain).
[(4A)For the purposes of this paragraph and paragraph 8, the cases where the amount of rent payable under a lease is uncertain or unascertained include cases where there is a possibility of that amount being varied under—
(a)section 12, 13 or 33 of the Agricultural Holdings Act 1986,
(b)Part 2 of the Agricultural Tenancies Act 1995,
(c). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(d). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(5)No account shall be taken for the purposes] of this Part of any provision for rent to be adjusted in line with the retail prices index.]