Subject to the following provisions of this Part, a person exercising the right to buy is entitled to a discount of a percentage calculated by reference to the period which is to be taken into account in accordance with Schedule 4 (qualifying period for right to buy and discount).
The discount is, subject to any order under subsection (2A)—
The Secretary of State may by order made with the consent of the Treasury provide that, in such cases as may be specified in the order—
shall be such percentage, higher than that specified in subsection (2), as may be specified in the order.
An order—
Where joint tenants exercise the right to buy, Schedule 4 shall be construed as if for the secure tenant there were substituted that one of the joint tenants whose substitution will produce the largest discount.