In keeping with what many have already said here- perhaps the problem is DC doesn't go far enough!
I think we're getting all confused here between genuine SEN and NT kids. I believe DC means it would be a good idea to keep NT kids back at primary til they HAVE mastered the basics which are crucial to secondary school success.
He hasn't gone far enough in that every child should be assessed every year from preschool for ability to cope with the next school year, academically and socially and placed accordingly. Too many of us are thinking of our own child, alone, cast adrift in the year below their peers- Well, wouldn't a good few of those peers also be repeating?? And as for numbers, wouldn't a good few kids also be working at a year above their 'chronologically correct' school year?
Of course there's a real issue about Ed Authorities refusing to issue statements so as to avoid the costs of SEN provision. That's a separate thing- not less important, just separate.
IMO, NT primary age children fail to reach the required standards for one or all the following reasons:
-They're lazy and cruise along, safe in the knowledge that they'll go on 'progressing' through the years til they're popped out, at 16, functionally illiterate and full of anger at society for 'failing' them.
-They just haven't quite got the maturity to be able to master that particular subject area, yet. Give them another shot, another year and they'll be away.
-They have the sorry misfortune to have been born into rubbish family backgrounds where no-one cares about them or their schooling.
I believe any teacher would be able to identify these causes. What we need is the will and the money to address them as soon as is possible in a child's life. Repeating a 'dodgy' year may be one solution amongst others.
And, fwiw, it so ANNOYS me the way politicians blame the schools/teachers for all society's ill. Can we not see a correlation between the highest teenaged (thus presumably unplanned-unwanted) pregnancy rates in the western world and so many failing kids? See my final point above! And yes I KNOW you don't have to be a teenaged single parent to be a less than able parent- anyone can be! but it's merely the statistics that bear the trend out that I'm talking about.
Finally, no I'm not a teacher or a TA! I'm just a parent who would like to see those issues of parental responsibility dumped back where they belong- the parents' doorstep, not the teachers' workload!