32.—(1) Subject to the other provisions of this Act, permission shall be required under this Part—

(a) in respect of any development of land, not being exempted development, and

(b) in the case of development which is unauthorised, for the retention of that unauthorised development.

(2) A person shall not carry out any development in respect of which permission is required by subsection (1), except under and in accordance with a permission granted under this Part.