6. The Principal Act is amended by inserting the following section after section 19:

“19A. (1) In setting the rent under the tenancy of a dwelling referred to in section 3(4) the amount of rent under the tenancy of a dwelling—

(a) referred to in paragraph (a) of section 3(4), shall be determined in accordance with the contract or lease referred to in section 3(2A), and

(b) referred to in paragraph (b) of section 3(4), shall be determined in accordance with the terms of the assistance referred to in that paragraph.

(2) Where there is a subsequent setting of rent under a tenancy referred to in subsection (1) by way of a review under section 20A, the amount of rent set following such review shall be determined—

(a) in the case of a dwelling referred to in paragraph (a) of subsection (1), in accordance with the contract or lease referred to in that paragraph, and

(b) in the case of a dwelling referred to in paragraph (b) of subsection (1), in accordance with the assistance referred to in that paragraph.”.