Will the presenting officer be a memeber of the local authority if the school is VA or a member of the governing body?
If it's a VA school, it can choose who will represent it - usually the headteacher or other senior member of staff, or a governor. They could ask a LA officer to do it, but would have to pay!
Also, you mention that the presenting officer will put forward the case on behalf of the school (e.g. what tests were administered, what scores were required) but the school will not give me a breakdown of the results so how can I prepare a strong appeal?
There's the Data Protection Act, but unless the appeal is going to be late in the summer term, it won't help. Schedule 7 of the DPA, says among other things that the public authority does not have to release exam/test results until five months after the “relevant day”. (The relevant day is the date on which the "data controller" has both a properly submitted request for information and the information itself.)
If the appeal is earlier, then at the hearing - under "Questions to the Authority" - you can try asking. They may or may not comply, but you can point out to the panel that an earlier request was refused, and that it would have helped you to prepare for the appeal if the information had been made available. As discussed previously, try to make it sound as factual as possible (i.e. not too critical).
I had mentioned the extenuating circumstances in my message to the appeals box and I just wondered if you thought that the panel would consider it as I cannot provide any doctors note.
They are obliged to consider any extenuating circumstances you put forward, but it is for them to judge to what extent the child's performance may have been affected, and I'm afarid panels do vary. Some are quite reasonable, others may be much harder to persuade.
Hope this helps.