6(1)At any time when a suspension order is in operation the mineral planning authority may by order direct—E+W
(a)that steps for the protection of the environment shall be taken in addition to or in substitution for any of the steps which the suspension order or a previous order under this sub-paragraph specified as required to be taken; or
(b)that the suspension order or any order under this sub-paragraph shall cease to have effect.
(2)An order under sub-paragraph (1) is in this Act referred to as a “supplementary suspension order”.