A person is subject to a charging authority's collective community charge on any day if—
But a person cannot be subject to a charging authority's collective community charge on a day which falls before 1 December 1989.
For the purposes of this Part a dwelling is a designated dwelling on a particular day if it is a building, or part of a building, which on the day concerned is designated under this section.
The registration officer may designate all or part of a building for the purposes of a charging authority's collective community charges if at the time of designation—
A registration officer who has designated a building or part may revoke the designation if at the time of revocation the conditions for designation in subsection (3) above are no longer satisfied.
A designation under this section shall take effect at the end of the period of 7 days beginning with the day on which it is made, and shall cease to have effect at the end of the day (if any) on which it is revoked.
A person has a qualifying interest in a designated dwelling on a particular day if at any time on the day—
"Interest" means a legal estate.
Where a building is situated in the areas of two or more authorities, it and each part of it (whether or not designated) shall be treated as situated in the area in which the greater or greatest part of the building is situated.