Except as provided by section 63, the validity of—
any order under section 23 or 26 (whether before or after it has been confirmed); or
any such decision by the Secretary of State as is mentioned in subsection (2), or
a relevant costs order made in connection with any such order or decision,
shall not be questioned in any legal proceedings whatsoever.
Those decisions are—
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
any decision on an application referred to the Secretary of State under section 12 or on an appeal under section 20;
any decision to approve or reject a local listed building consent order or part of such an order;
any decision on an appeal under section 26K;
any decision to confirm or not to confirm a listed building purchase notice including—
any decision not to confirm such a notice in respect of part of the land to which it relates, and
any decision to grant any consent, or give any direction, in lieu of confirming such a notice, either wholly or in part;
any decision to grant listed building consent under paragraph (a) of section 41(6) or to discharge a condition or limitation under paragraph (b) of that section;
any decision on an application for listed building consent under section 82B.
In this section, " relevant costs order " means an order made under section 250(5) of the Local Government Act 1972 (orders as to costs of parties), as applied by virtue of any provision of this Act.
Nothing in this section shall affect the exercise of any jurisdiction of any court in respect of any refusal or failure on the part of the Secretary of State to take any such decision as is mentioned in subsection (2).