Herman rightly distinguishes between above average and well-above average.
What that means in practice varies from area to area (note what Sally-Anne says about the social mix). Where the standard is very high, the top 30% locally might be the equivalent of the top 10% nationally.
Our advice on academic evidence is here:http://www.elevenplusexams.co.uk/appeal ... cation#b11
I too have seen your message to the Appeals Box, Lookinglass. Sorry you had such a tough time. I think it hinges on the actual words used. There might be grounds for a complaint, but it rather depends just how much light the clerk's notes shed on exactly what was said. You might wish to request a copy (there's a charge of £10), but I'm afraid there's no guarantee they'll help as they're only meant to be a brief notes.