Taffeta you said it's also easy to say it doesn't matter what other people's children are doing when your school doesn't stream. Then it does matter. A great deal.
I'm sorry but I still can't see why it matters what other children are doing. I never bothered what the others were doing. Their progress or abilities didn't concern me in the slightest . I wasn't one of those mothers who, with faux altruism, went into my child's class to listen to reading simply in order to nose in on what the others were doing to make comparisons like so many do. If comparisons are necessary, then your child's teacher will make you aware of it at the appropriate time.
If you become aware, or it is brought to your attention, that your child is struggling at school then as a parent is is your duty and obligation to do all you can to help bring them on. If it requires you speaking to the teacher to make a plan to support them at home then you do it, no question about it.
If after all of that they are able to move onto the "higher table" or put into the "higher group" or whatever it may be called at your child's school then great. If not, and they are still struggling, then that may very well just be a fact of your child's life. At least you will be secure in the knowledge that as a parent you have done all you can to raise their level of achievement and address any shortfall that may be occuring in the classroom.
If you aren't prepared to do whatever it takes to help them and simply blame the school or the time of year that they were born then you're doing your child a grave disservice.
If you'd prefer to sit back and say, "all the other children make my child feel thick" or "oh, they're bound to be behind because they have a late summer birthday and are much younger than all the others", that's just a cop out in my view. Frankly, I think it beggars belief that some people are still using this as an excuse into secondary school too.
I'm sorry but I still fail to see that worrying about what other children in the class are doing has any bearing on your own child's progress. Education does not begin and end in the classroom. Sadly though, far too many parents seem to think that it does and find it an easier route to blame everyone and everything (including bonkers surveys) apart from themselves for their children's lack of progress.
Your child's individual achievements and abilities, or lack thereof, will be noticed by any teacher worth their salt, who will tailor their learning accordingly. Anyone who tells you otherwise is doing decent teachers a great disservice.
Surveys will always manipulate data in order to prove a hypothesis. This survey is no different.
Children are all individuals and having a birthday fall at a certain time of year is certainly no measure of intelligence, or marker for how well they will perform at school or benchmark for what they will ultimatley achieve.
If parents of late summer born children send their children off to school on the first day expecting very little of them, or expecting that they will be disadvantaged in the classroom due to the time of year they were born however, I'm afraid this will prove to be a self fulfilling prophecy.