I am writing to the head at DTs' school to complain about the behaviour of a boy in their class. They're in Y1, he has been excluded for 10 days of the last 12 and they have been so much happier. He is violent on a regular basis and seemingly turns it on as and when he chooses. Class teacher is at the end of her tether. Any choice phrases for me to include? Am thinking of things like impact on the learnign of the majority at the expense of one boy etc...