This section applies where an application for planning permission for any development of land is made to a local planning authority and either—
the development would, in the opinion of the authority, affect the character or appearance of a conservation area; or
the development is of a kind specified by the Secretary of State for the purposes of this section and in respect of land in or adjacent to a conservation area.
The local planning authority shall—
publish in a local newspaper circulating in the locality in which the land is situated ; and
for not less than seven days display on or near the land,
a notice indicating the nature of the development in question and naming a place within the locality where a copy of the application, and of all plans and other documents submitted with it, will be open to inspection by the public at all reasonable hours during the period of twenty-one days beginning with the date of publication of the notice under paragraph (a) of this subsection.
The application shall not be determined by the local planning authority before both the following periods have elapsed, namely—
the period of twenty-one days referred to in subsection (2) of this section ; and
the period of twenty-one days beginning with the date on which the notice required by that subsection to be displayed was first displayed.