Section 18

Subsection (1) shall not apply to the use of any land or building for the purposes described in paragraph 19(2)(d).

Subsection (1) shall not affect the continuance of the use of any land or building for the purposes for which and to the extent to which it was lawfully being used prior to the date when a local plan first came into effect in the area concerned or, where there has been a change of local plans or in a local plan, the date when the change became effective.

Prohibition of development without planning permission