It is also the most common reason given for suspensions, accounting for 30 per cent last year, up from 23.3 per… “Persistent disruptive behaviour” accounts for he highest proportion of pupil expulsions, according the latest official figures. This was cited as the cause for a third (34 per cent) of all permanent exclusions last year, up from 29.6 per cent a decade ago.  Gavin Williamson, the new Education Secretary, is to launch a review into teacher training which will focus on implementing  stricter behaviour strategies to tackle disruption in schools.  Teachers will be given training to make them tougher with unruly children as part of a Government drive to restore discipline to the classroom.