Subject to subsection (2) of this section and to paragraph 3 of Schedule 12 to this Act, these provisions shall have effect without prejudice to the operation of sections 67 and 68 of this Act; and, where these provisions and those sections are applicable to the same application for planning permission, the requirements of both must be complied with.
Compliance with section 74(1) of this Act shall not be required in respect of an application for planning permission for the development of land in any manner specified in section 67(1) of this Act if—
no office premises will result from the development except such as are comprised within the curtilage of an industrial building and are used or designed for use for providing services or facilities ancillary to the use of other premises in the same building or curtilage; and
there has been issued by the Secretary of State and furnished to the local planning authority with the application a copy of an industrial development certificate with conditions attached to it by virtue of section 70(3)(b) of this Act.