I don't think you did anything wrong, Faithful - it looks to me that you were up against a very strict panel, and unfortunately it is not possible to challenge their judgement as such, however strongly we might disagree.
However, I do have some procedural concerns.
1. I see no indication in the decision letter that the panel considered whether the admission arrangements (including the area’s co-ordinated admission arrangements) complied with the mandatory requirements of the School Admissions Code and Part 3 of the School Standards and Framework Act 1998. If they did indeed fail to do this, it would technically be a breach of the Code.
2. "The Panel also noted your DS interest in Maths and Music but confirmed that the school does not admit pupils because of an aptitude in either of those subjects
". The panel was perfectly entitled to decide that your reason was not strong enough to outweigh the prejudice to the school, but I do not see the relevance of their reference to the admission rules. The Code clearly states that the panel must take into account the appellant’s reasons for expressing a preference for the school - but if their response is simply to reject your reason because it is not included within the admission rules, it begs the question 'What then is the point of an appeal?' The panel should judge any reason you put forward on its merits.
3. If the EP report was a significant part of your case, I am surprised to see no mention of it in the decision letter, even allowing for the cursory reference to 'other evidence'.
4. "When we got the appeal papers, they stated our DS position on the waiting list and the Panel compared his scores to the last boy admitted in the decision letter.
" They are entitled to refer to your son's scores, and those of the last boy admitted. However, the school should not have revealed your son's position on the waiting list, as it is a breach of the Code for the panel to consider this. If the clerk or chair did not intervene at the hearing to point this out, it raises some concerns.
The reference at the end to the YPLA is completely out of date. The EFA took over responsibility for complaints about academy appeals on 1st April.
If you wish to try complaining to the EFA about these matters, you will find guidance here:http://www.education.gov.uk/aboutdfe/co ... -academies
It's only fair to caution you, though, that it could be a long drawn out process, with no guarantee about the eventual outcome! The EFA would have to make a judgement not simply about whether there were any procedural errors, but whether those errors were so serious as to cause an injustice.