Paragraph 19
(1)
The appropriate Ministers may by directions restrict a planning authority's powers in relation to the giving of approval under Part 1 of this Schedule.
(2)
Directions under this paragraph may—
(a)
be given in relation to a specified approval or approvals of a specified description,
(b)
be expressed to have effect without a time-limit or during a specified period, and
(c)
revoke or vary previous directions under this paragraph.