Elliot, Karen; Smees, Rebecca; Thomas, Sally; Elliot, Karen, ISEIC (International School Effectiveness and Improvement Centre) Institute of Education, University of London, 20 Bedford Way, London WC1H 0AL; Smees, Rebecca, ISEIC (International School Effectiveness and Improvement Centre) Institute of Education, University of London, 20 Bedford Way, London WC1H 0AL; Thomas, Sally, ISEIC (International School Effectiveness and Improvement Centre) Institute of Education, University of London, 20 Bedford Way, London WC1H 0AL