I decided my appeal would not be based upon non qualification or over subscription as I realised I didnt stand a chance with these arguments. Instead I have appealed on the basis that my child needs a place at her local grammar school and that her need outweighs any prejudice to the school.
Sorry, not sure I understand, but it may just be a matter of terminology.
Am I right in thinking places at this school are allocated by rank order? If so, is there a minimum qualifying score and did she achieve it? The Code of Practice states:
the panel must be satisfied that there is evidence to demonstrate that the child is of grammar school ability and, where applicable, that the appellant’s arguments outweigh the admission authority’s case that admission of additional children would cause prejudice.
I would avoid the phrase "exceptional medical/social criterion" as this is normally used as an oversubscription rule in the published admission arrangements, rather than in an appeal, and is a very stiff test. Assuming there is no issue about qualification, the test at an appeal is the one you mention (the need for a place simply outweighing the prejudice to the school).
You don't normally stand up for an appeal presentation, and you should try not to worry too much about it. I wouldn't attach much weight to the written statement of appeal or to the presentation! In my view what matters is the evidence, and how you respond to any questions.
One question you might well be asked is just how frequent the "regular appointments" are going to be.