1.31 ..... Appellants are appealing over a matter that is very important to them. Admission authorities must give appellants appropriate guidance and information before the hearing to enable them to prepare their case for appeal ...... and, having regard to the Data Protection Act 1998 and Freedom of Information Act 2000, must respond to any reasonable requests for information about the school or the admissions process that the appellant may think they need to help them with this preparation. [Appeals Code]
You are certainly entitled to ask for information that will help you prepare for the appeal.
Many authorities - but unfortunately not all - will automatically provide for the appeal hearing the latest information they have for expected numbers on roll for September in each year group (years 7-13). You can then see at a glance whether in each of years 7-11 the school is below, at, or above its PAN (published admission number).
You can also compare the total number expected to be on roll with the school's net capacity. (Net capacity, a figure which the admission authority ought to include in the appeal papers, is a measurement of the total number of pupils the school can accommodate.)
However, even if the figures were to show that the school is consistently below PAN in years 8-11, if the school is at
its admission number for year 7 in September (and this is presumably the reason why appeals are taking place), that is the point at which an appeal panel will consider whether there would be prejudice to the existing pupils.