Just read this piece by Libby Purves, The Times columnist.
She makes a connection between our low level of social mobility, poor educational standards and low level, continuous disruption in schools. Then plays out some of the extreme scenarios you could envisage to control such behaviour.
Now DS isn't in the school system yet and I have no way of knowing whether what she describes is the real situation in the UK. C'mon mumsnetters, tell me: is it as bad as she's suggesting? Do we really need security staff in every lesson ?