Ruby dont forget that they had to admit 5 extra pupils after the initial allocations as they had sisters at the school - medway council had not put this rule into action when originally allocating the places so Fort pitt had to offer these girls(who had originally been turned down) a place because of the sibling rule. Maybe the 7 miles was one of these? I dont want to sound negative as each yearit is so different.
Or maybe there are a few who did get in after the recent appeals? I dont know if you can call the school and ask them this question. Might be worth a try