In section 6 of the 1975 Act (valuation by formula of certain lands and heritages), after subsection (5) there shall be inserted the following subsection—
“(5A)An order under this section may provide that the assessor for any specified valuation area shall carry out such functions in relation to the operation of a formula as may be specified in the order, notwithstanding that such functions may include the valuation of lands and heritages in another valuation area.”.