In section 2 (prohibition notices)—
(a)
in subsection (1) (notices in respect of activities which are, or are about to be, carried on and involve a risk of serious personal injury or pollution), for “about”, in both places where it occurs, substitute “likely”; and
(b)
for subsection (4) (notices to have immediate effect only if the risk isimminent) substitute—
“(4)A direction contained in a prohibition notice in pursuance of subsection (3)(d) shall take effect—
(a)at the end of a period specified in the notice, or
(b)if the direction is given in pursuance of subsection (3)(d)(ii) or the notice so declares, immediately.”