I was the typical late developer - bottom set streamed throughout primary school and most of comprehensive. Which if nothing else had dire consequences on my self-esteem, and still does. I then went on to get three As for A Level, a v good BA and then an MA. Now my son is at primary school and seems to be reliving somewhat my past - he's been streamed and is towards the bottom and is convinced he's stupid, though he palpably isn't (he's had cognitive intelligence tests done and scored on the 97th percentile for his age!). But...his intelligence isn't conventional, nor was mine, and as I have found, independence of thought doesn't get you very far at least till BA/higher education level.