No certificate may be granted under section 7B in respect of a final determination of the Special Immigration Appeals Commission where, by virtue of any enactment (other than sections 7B and 7C), no appeal would lie from that decision of the Commission to the appropriate appeal court, with or without the leave or permission of the Commission or the appropriate appeal court.

No certificate may be granted under section 7B in respect of a final determination of the Commission where, by virtue of any enactment, no appeal would lie from a decision of the appropriate appeal court on that determination of the Commission to the Supreme Court, with or without the permission or leave of the appropriate appeal court or the Supreme Court.

Where no appeal would lie to the appropriate appeal court from a final determination of the Commission except with the leave or permission of the Commission or the appropriate appeal court, no certificate may be granted under section 7B in respect of a final determination unless it appears to the Commission that it would be a proper case for granting leave to appeal to the appropriate appeal court.

No certificate may be granted under section 7B in respect of a decision or order of the Commission made by it in the exercise of its jurisdiction to punish for contempt.