Thanks for your responses. WIll answer in "bulk"
To the people who said that half an hour should be enough for lunch - yes, of course it is. However, in his hour lunch break he had half an hour detention and the remainder of the lunch break is spent walking down to the hockey centre - so effectively they lose half an hour of lunch that day.
To the people who say their children only get half an hour, the school starts earlier, and has a longer lunch break to get clubs done as much as possible during the school day.
I don't tell him he is useless and cack handed - I was telling you!
I have told the school several times about the colour blindness - I find teachers forget really quickly about it and the way it can cause problems.
There were other children put in detention for not having drawn the coloured line. My DS thought he HAD drawn a coloured line.
Usually, if my Ds complains of unfairness, I immediately say I am going into school, as this always leads to "well, actually it was because I did xyz" so I never end up going in. It is always a threat to find out the truth. This time he said "you don't have to, but if you happen to see the teacher I think you ought to mention it to him as he may do it again".
I have told him to speak to his tutor to ask how to handle it if it happens again. I don't want to upset the teacher by the children saying they don't want to do it because they need to get to hockey. Nothing likely to wind a teacher up more than a child thinking another lesson is more important ...
To those who said why was I doing the printing. I work from home - we have one printer which is a work printer and I never allow him to use it. In the same way he is not allowed to use my work computers. He has his own laptop. I don't think that is unreasonable.
He always does his homework and spent longer than the requisite half an hour on the design that made the teacher cross.
4C in his school is considered unacceptable. To get three of them in a week is therefore quite something.
The comments the teacher has made on his drawings lead me to believe that he IS criticising lack of talent. I saw them last night, but my son has taken them to school today, so cannot give you a word for word replay.
I won't go in or email - however, I will take the offending items into school on parents evening along with the work he has done at his previous school in DT which should show conclusively that my DS is not being difficult - simply finding it very difficult.
It annoys my son immensely, as he finds most things very easy - maths, English, sport etc - but the more he tries the worse it looks. Sometimes I suggest that he stops trying to improve things, because it just looks more of a mess than before he tried to improve it (a bit like an ex of mine doing the grouting - the first attempt should have been accepted rather than the "improvement").
Thank you to everyone who commented - good and bad - I do know he is in no way an angel and as I said, am more than happy for detentions if he has been mucking around or chatting in class. After a warning.
He managed to get another detention yesterday (which will mean "community service" today!) - he and 5 other boys did not wait for the crossing to go green on the way to hockey and therefore detention was in order. Have no problem with that at all. In fact, my response would be for hte boys to have to hold hands the next time they walked down to the hockey pitches - that would soon make them remember to wait for the crossing lights!
The teacher did say to them that he did see them checking four or five times that there as no traffic, but that was not acceptable. I suspect he was watching them to see what they did and could see the road was clear - in order to give the detention to make sure that they did not try it again when the road may have been busier. (hope that makes some sort of sense!)
Anyway - thanks again!