285 Validity of enforcement notices and similar notices
285 Validity of enforcement notices and similar notices

(1)     . . . the validity of an enforcement notice shall not, except by way of an appeal under Part VII, be questioned in any proceedings whatsoever on any of the grounds on which such an appeal may be brought.

(2)     Subsection (1) shall not apply to proceedings brought under section 179 . . . against a person who—

(a)     has held an interest in the land since before the enforcement notice was issued under that Part;