I assume there's no point mentioning KS1 SATs.
I wouldn't routinely suggest including the print-out of KS1 results - although, bearing in mind that the current school doesn't do SATs, I do see some advantage in your confirming level 3s at KS1.
Going on the 'less is more' principle I'm wondering whether or not to include his end of Yr5 report as it won't necessarily add to anything the head's written. What do you think?
Appeal panels certainly liked to see the year 5 report, especially if it focused on ability and achievement, rather than on "This term we have been learning
......." or "Hardworking and diligent, exemplary monitor .......
Sometimes a statement of support can read like a reference, whereas a report to parents might be less cautiously worded! It could be reassuring for a panel to see that a statement of support is not just a rose-tinted version of the reality .........
If the year 5 report is good - as I expect your son's is - personally I'd be inclined to include it.