bayleaf, batters and robinw - thanks for your concern. I think lots of these details will get ironed out at the regular meetings we will be having with my son's teacher, but you can see why I am confused. Just to pick up on a few things:
bayleaf, you're right, the behaviour book is principally because my son is not performing at the level of his ablity. The classroom incident was not the main reason behind it, I think, even though the book was only suggested after this happened.
I still don't know why my son has a behaviour book and this other boy doesn't. From what my son says, this boy is also a handful and gets about as many bad marks as my son (as do one or two other boys). At times they get into trouble when my son doesn't. Yet my son is the only child with a behaviour book. As you say, teachers won't discuss other children (quite rightly) so I am in the dark. I have to assume the behaviour book is there to improve my son's performance. Perhaps the other boys all perform at their ability, though most of them are in lower sets than my son.
The Harry Potter thing still rankles me. There are five bands of reading and my son is on the second from top band. He has read lots of the books on his band and this term his reading has speeded up no end - he reads lots at home. He does seem to take in the stories too. He asked the teacher if he could choose a book from the top band and he was told no, not till his WRITTEN work improves. I went to see the teacher about this and she stood by her decision but challenged him to read Harry Potter. This is a book that is on the top band. Now he's read it, she has suggested he reads another, but still won't let him 'officially' choose books from the top band. Mad!
Also, spellings - my son is in the middle spelling group. Few children in class get their 10 spellings right each week. My son is one of them. Yet he only practices his spellings for about 10 minutes - he knows how to spell most of the words without trying. I suggested that he needed challenging with harder spellings, but his teacher did not seem to think he was in the wrong group - just said she'd bear it in mind.
I suppose, in my son's class, there may be lots of children with higher verbal reasoning scores: Perhaps most of them are above the 50th percentile so my son's score is nothing special. I just wish someone would tell me if this is the case. It's no good being told your son is above average in ability if you can't set this in context!
So I do think I need to spend time at school and do as Robin suggests - get talking to the dinner ladies.
Hopefully, things will become clearer in the fullness of time.