30.—(1) Subject to subsections (2) and (3), the terms of a Part 4 tenancy shall be those of the tenancy mentioned in section 28 of which it is a continuation.

(2) At any time during the period of a Part 4 tenancy, the parties may, by agreement, vary its terms.

(3) Neither—

( a) any term of the tenancy of which the Part 4 tenancy is a continuation, nor

( b) any term purported to be provided for by a variation under subsection (2),

shall be a term of a Part 4 tenancy if the term is inconsistent with this or any other Part of this Act.