Notwithstanding anything in section 67 of this Act, but subject to section 69 of this Act, an industrial development certificate shall not be required if the industrial floor space to be created by the development in question (in this section referred to as " the proposed development"), together with any other industrial floor space created or to be created by any related development, does not exceed 5,000 square feet, excluding, where an industrial development certificate has been issued in respect of any related development, any floor space created or to be created by that development or by development carried out, or for which planning permission has been granted, before the issue of that certificate.
Regulations made for the purposes of section 67 of this Act by the Secretary of State may direct that no industrial development certificate shall be required in respect of the erection, in any area prescribed by or under the regulations, of industrial buildings of any such class or description as may be so prescribed, or in respect of a change of use whereby premises in any such area, not being an industrial building of a class or description so prescribed, will become an industrial building of such a class or description.
In this section " industrial floor space " means floor space comprised in an industrial building or industrial buildings of any of the prescribed classes.
For the purposes of subsection (1) of this section development shall, in relation to an application for planning permission (in this section referred to as " the relevant application "), be taken to be " related development" if—
and (in either case) it fulfils one or other of the conditions mentioned in subsection (5) of this section.
The said conditions are—
For the purposes of subsection (5)(c) of this section, an application is pending on a particular date if—
In subsection (4) of this section and in this subsection "building" does not include a part of a building; and any reference in subsection (4) of this section to development relating to a building is a reference to the erection, extension, alteration or re-erection of the building or a change of use of the whole or part of the building.
In this section " the prescribed classes " has the same meaning as in section 67 of this Act.