A person aggrieved by a demolition order may, within the period of 28 days beginning with the day on which the order is made,, appeal to the appropriate tribunal.
No appeal lies at the instance of a person who is in occupation of the premises or part of the premises under a lease or agreement with an unexpired term of three years or less.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On an appeal the tribunal—
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
If an appeal is brought the order does not become operative until—
and for this purpose the withdrawal of an appeal has the same effect as a decision confirming the order or decision appealed against.