like all secondary schools kingsdale has a mix of students but its several years now since there was any seriously difficult behaviour issues at the school. the school is one of the best performing schools in London and the vast majority of students are well motivated and supported by involved parents. the school has a regular parents forum where any issues can be raised and will be followed up immediately. don't know why the member of staff left after 6 months - its a school where the staff work incredibly hard and some people can't hack it. I worked there for 11 years (just retired) and saw the school go from special measures to serious weaknesses to good and finally OUTSTANDING. it is a triumph and a testament to the dedication of the staff. go back again and again till you are sure its the right place for your child, attend any events at the school and if you do send your children there get involved and support the school.