In this Act, except where the context otherwise requires, "development", subject to the following provisions of this section, means the carrying out of building, engineering, mining or other operations in, on, over or under land, or the making of any material change in the use of any buildings qt other land.
The following operations or uses of land shall not be taken for the purposes of this Act to involve development of the land, that is to say—
For the avoidance of doubt it is hereby declared that for the purposes of this section—
Without prejudice to any regulations made under the provisions of this Act relating to the control of advertisements, the use for the display of advertisements of any external part of a building which is not normally used for that purpose shall be treated for the purposes of this section as involving a material change in the use of that part of the building.
In this Act " new development" means any development other than development of a class specified in Part I or Part II of Schedule 8 to this Act; and the provisions of Part III of that Schedule shall have effect for the purposes of Parts I and II thereof.