Where the Secretary of State gives a decision on an application for a direction under section 8, any of the following may appeal to the High Court against the decision on a point of law—
Where the Welsh Ministers give a decision in proceedings—
the relevant person or the building control authority or, as the case may be, the registered building control approver may appeal to the High Court against the decision on a point of law.
In subsection (1) above, "the relevant person" means—
At any stage of the proceedings on such an appeal ... or application as is mentioned in subsection (A1) or (1) above—
In relation to proceedings in the High Court or the Court of Appeal brought by virtue of this section, the power to make rules of court includes power to make rules—
No appeal to the Court of Appeal shall be brought by virtue of this section except with the leave of the High Court or the Court of Appeal.
In this section, "decision" includes a direction, and references to the giving of a decision shall be construed accordingly.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .