6(1)The Secretary of State shall calculate the non-domestic rating multiplier for a chargeable financial year beginning in or after 1991 and, as soon as is reasonably practicable after doing so, shall serve on each charging authority a notice stating the multiplier as so calculated.
(2)Where the financial year is one for which the Secretary of State has calculated a figure for C under paragraph 5(5) above, the notice must contain the figure he has calculated.
(3)Where the financial year is one at the beginning of which new lists must be compiled, the notice must contain—
(a)his estimates made under paragraph 5(6) and (7) above, and
(b)the date determined by him under paragraph 5(10) above for the purpose of making the estimates.
(4)A calculation under sub-paragraph (1) above is invalid unless one or both of the following conditions is fulfilled—
(a)it is made after the revenue support grant report for the year has been approved by resolution of the House of Commons;
(b)it is made on or after 1 March in the preceding financial year.
(5)A calculation under sub-paragraph (1) above is invalid if made at a time when an order under paragraph 5(3) above which is effective in relation to the year has not come into force.