Would you still advise on keeping the letter quite short, bearing in mind we will not be at the review to present our evidence or is ok to go into detail as to the reasons why we feel our daughter did not perform as well as she could of?
I understand the point, but would still keep the letter as concise as possible. It's not what you write that matters - it's the supporting evidence
. (Numerous references to this in the Q&As.)
Her scores were VR 77.3, M 29.94 and NV 12.99. Do you think we need to mention how poorly she did in the Non Verbal?
They'll spot this for themselves!
No point in raising the issue unless you have an argument to offer (and, to be honest, I don't think being better at English will impress).