There is also a mention that she has taken tests in QCA and non-statutory tests which have placed her in high ability group. However no marks are included for these tests, do we need to try and push the tutor to give individual scores?
You do have a legal right to any information in your daughter's school record. I'm a bit doubtful, though, just how much marks in curriculum tests would mean to an appeal panel. Levels are probably more helpful. Or, if 'above average' (which could probably mean anything from 4a to level 6), it would be helpful to know whether the standard is well
Also there is no mention that her tutor 'supports the appeal' does this also make a difference? (she has just written a reference for my DD including quite a few positive comments.)
If the focus of your appeal is academic/educational, it may well be sufficient for the current school to write about academic achievement. On the other hand, if there were strong social reasons why your daughter should attend the school in question, and these are matters that the form tutor has been involved in, I think one would probably expect a clear statement of support explaining why the school being appealed for would best meet her needs.
I have also spoken to an E.P about an accademic assessment, she did however mention that this is probably more useful in areas like Bucks as most schools there are selective, she felt it may not be worthwhile when making an appeal in Herts. Could you advise on this the school we wanted to appeal for is partially selective?
No easy answer, because one can never be sure just how much weight an individual appeal panel will give any particular bit of evidence. It also depends on the sort of case you want to put forward. If, for example, the academic test comprised VR and maths, and you think the VR result was not really representative of her ability, then an EP report showing very superior verbal comprehension skills could be relevant, especially if you have little in the way of alternative evidence (e.g. a series of very high CAT VR scores). On the other hand, if it was in maths that she seems to have 'underperformed', confirmation from the current school of level 6 standard ought to be sufficient.