21. In section 155 (repayment of discount on early disposal)—
(a)in subsection (1), for the words from “shall contain” to “no discount)” substitute the words “may, at the discretion of the landlord, contain, unless there is no discount” and add at the end of the subsection the words “but not one the effect of which would be more onerous”;
(b)in subsection (2), omit the words “In the case of a conveyance or grant in pursuance of the right to buy”; and
(c)omit subsection (3).