The Secretary of State may by order made with the consent of the Treasury vary all or any of the percentages specified in section 569(3) (relevant percentages for purposes of contribution to expenditure of local housing authority) in respect of assistance or payments, or a class of assistance or payments, specified in the order.
An order—
may make different provision for assistance given or payments made in respect of defective dwellings in different areas or under different provisions or for different purposes of the same provision;
shall be made by statutory instrument; and
shall not be made unless a draft of it has been laid before and approved by a resolution of the House of Commons.
An order applies to assistance given or payments made in pursuance of applications made after such date as may be specified in the order, and the specified date shall not be earlier than the date of the laying of the draft.