A local housing authority who have made a demolition order must serve a copy of the order on every person who, to their knowledge, is—
The copies required to be served under subsection (1) shall be served within the period of seven days beginning with the day on which the order is made.
A copy of the order is to be regarded as having been served on every occupier in accordance with subsections (1) and (2) if a copy of the order is fixed to some conspicuous part of the premises within the period of seven days mentioned in subsection (2).
A demolition order against which no appeal is brought under section 269 becomes operative at the end of the period of 28 days beginning with the day on which the order is made and is final and conclusive as to matters which could be raised on an appeal.
Section 246 of the Housing Act 2004 (service of notices)—