Do you think that the panel would see this as extenuating circumstances.
Yes, I think they probably will.
I feel that because we didn't mention it to the school and get medical advice from GP, it would look like an excuse that we cannot evidence.
It's not something for which evidence is normally available, so the panel will understand and are unlikely to think of it as an excuse.
It's a personal issue and would a short paragraph suffice on the appeal notes which I can then mention in detail to the panel in person. To be honest, i don't know how I am going to address this in my notes and whether i should just wait. In your opinion, should this be mentioned in the original appeal notes?
Do what you
feel most comfortable with. It will make absolutely no difference whether you mention it in your appeal letter or at the hearing - just tell the panel one way or another!