Any notice required or authorised to be served under this Act—
shall be in writing; and
may be sent by post.
Any notice purporting to be a notice served under any provision of Part I or III by the requisite majority of any qualifying tenants (as defined for the purposes of that provision) shall specify the names of all of the persons by whom it is served and the addresses of the flats of which they are qualifying tenants.
The Secretary of State may by regulations prescribe—
the form of any notices required or authorised to be served under or in pursuance of any provision of Parts I to III, and
the particulars which any such notices must contain (whether in addition to, or in substitution for, any particulars required by virtue of the provision in question).
Subsection (3)(b) shall not be construed as authorising the Secretary of State to make regulations under subsection (3) varying any of the periods specified in section 5A(4) or (5), 5B(5) or (6), 5C(4) or (5), 5D(4) or (5) or 5E(3) (which accordingly can only be varied by regulations under section 20(4)).