Paragraph 4 I1

If it appears to the Treasury that the list of factors in sub-paragraph (3) or (4) of paragraph 3 has become outdated, the Treasury may by order made by statutory instrument bring the list up to date by amending the sub-paragraph so as to add, omit or alter any factor.

A statutory instrument containing an order under sub-paragraph (1) may not be made unless a draft of the instrument has been laid before and approved by a resolution of each House of Parliament.