4. Section 14 of the Principal Act is amended—
(a) by omitting from paragraph (2) (b) “or” (last occurring); and
(b) by adding at the end of paragraph (c) the following word and paragraph:
“; or (d) the exemption of a proposal for the external design and siting of a building, either absolutely or subject to conditions, from the application, by virtue of section 6, of all or any of the provisions of Part VI of the Land Act”.