My understanding is, where you are appealing to a system that purely uses rank scores (like Birmingham), rather than a flat pass rate (like Bucks), you are not specifically appealing against over subscription. Your appeal lives and dies on a) proving academic ability and b) explaining away any shortfall in the 11+, possibly by way of extenuating circumstances. You cannot win an appeal on b) alone. My understanding (and I may be wrong!) is that if you win an appeal, the school offers you a place. This then means that if this takes the school over PAN, the waiting list effectively freezes until people reject the place they have been offered or don't turn up etc, bringing the school below PAN again, at which point they can make offers from the wait list again.
Saying that, appeals to the KES Birmingham, are notoriously hard to win - to the point of being almost impossible, so it may be a moot point.
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