Have you seen the Q&As?
I hate to bring up the fact that the exam procedure was disorganised at an appeal, but does anyone think I might have a case?
See B56(c):http://www.elevenplusexams.co.uk/appeal ... cation#b56
Or is there any way to get hold of the information that might prove that average results at different exam centres were better?
It should be possible to get information, but will take some effort.
You could write to each admission authority, requesting the statistics under Freedom of Information.
An example of a FOI request can be found here:http://www.elevenplusexams.co.uk/appeals/general#a39
Whether the statistics would prove anything is another matter (taking into account differences in the 11+, differences in the tested cohort).
I doubt it!