Subsection (2) applies if—
The notice or document is to be taken to be duly served, given or supplied if either the condition in subsection (3) or the condition in subsection (4) is met.
The condition is that the notice or document—
The condition is that the notice or document is so addressed and is marked in such a manner as may be prescribed for securing that it is plainly identifiable as an important communication and—
Subsection (6) applies if—
The notice or other document is to be taken to be duly served on or given or supplied to all persons having interests in, and on any occupiers of, premises comprised in that part of the land (other than a person who has given to that authority an address for the service of the notice or document on him) if—
This section is subject to any contrary provision made by or under this Act.