On an appeal under section 39 the Secretary of State may—
if he is satisfied that the correction or variation will not cause injustice to the appellant or the local planning authority.
Where the Secretary of State determines to allow the appeal, he may quash the notice.
The Secretary of State shall give any directions necessary to give effect to his determination on the appeal.
The Secretary of State—
If ... the Secretary of State proposes to dismiss an appeal under paragraph (a) of subsection (3) ... or to allow an appeal and quash the listed building enforcement notice under paragraph (b) of that subsection he need not comply with section 40(2).
Where it would otherwise be a ground for determining an appeal in favour of the appellant that a person required to be served with a copy of the listed building enforcement notice was not served, the Secretary of State may disregard that fact if neither the appellant nor that person has been substantially prejudiced by the failure to serve him.
On the determination of an appeal the Secretary of State may—
Any listed building consent granted by the Secretary of State under subsection (6) shall be treated as granted on an application for the same consent under section 10 and the Secretary of State's decision in relation to the grant shall be final.
Subsection (5) of section 250 of the Local Government Act 1972 (which authorises a Minister holding an inquiry under that section to make orders with respect to the costs of the parties) shall apply in relation to any proceedings ... before the Secretary of State on an appeal under section 39 as if those proceedings were an inquiry held by the Secretary of State under section 250.