We have decided to appeal as we have nothing to lose at present. Just wanted to ask as my DD has passed the 12 plus, do we need any evidence with regards to her educational ability? Or is it just the case that I can provide evidence of her musical ability?
Only if 12+ places were awarded in score order (and even then it would be optional).
From the Q&As:
a. This section deals with appeals where you are addressing the issue of non-qualification in the 11+ entry test(s) for grammar school. (In all probability, though, you will also need to address the issue of oversubscription. See section C2 .)
b. This section might also be relevant if the 11+ score was one of the admission criteria, and the score achieved was not high enough to gain a place. If you have relevant evidence of very high academic ability – and possibly of extenuating circumstances too – then, in addition to any arguments dealing with the oversubscription part of the appeal, you may wish to argue that your child was expected to perform even more highly in the 11+ than he/she did. An example of this could be if your child underperformed in two 11+ papers (VR and maths), and you have alternative evidence of very high VR scores and of very high ability in maths. I think you would need to explain to the panel why you are introducing the evidence.