The compulsory purchase of a building under section 47 shall not be started by the appropriate authority or by the Secretary of State unless at least two months previously the authority or, as the case may be, the Secretary of State has served on the owner of the building a notice under this section (in this section referred to as a "repairs notice")—
and the repairs notice has not been withdrawn.
Where—
the demolition of the building shall not prevent the authority or the Secretary of State from being authorised under section 47 to acquire compulsorily the site of the building.
An appropriate authority or the Secretary of State may at any time withdraw a repairs notice served by them on any person; and if they do so, they shall immediately give him notice of the withdrawal.
The Secretary of State shall consult with the Commission before he serves or withdraws a repairs notice in relation to a building ....
Where a repairs notice has been served on a person in respect of a building, he shall not be entitled to serve a listed building purchase notice in respect of it—
For the purposes of this section a compulsory acquisition—
In this section "appropriate authority" has the same meaning as in section 47.