In section 7, in subsection (4), for the words from “estimate the rateable valuation” to the end there shall be substituted the following words:—

“estimate the rateable valuation in that year of revaluation—

(a)

in a case where the valuation area is a region, of each district within that region ;

(b)

in a case where the valuation area is an islands area, of that islands area;

and shall send certified copies of the estimate so made to the rating authority for that region or for that islands area, as the case may be, to the councils of all districts within that region and to the Secretary of State.”