Key points are not available for this paper at this time.
Click to increase image sizeClick to decrease image size Acknowledgements I am very grateful to the editorial board of the Cambridge Journal of Education for supporting the publication of this special issue. I deeply appreciate all the work of the dozens of peer reviewers who commented with rigour and insight on all of the submitted manuscripts. I would like formally to record my thanks to the authors who have contributed to this issue and with whom I look forward to further discussion.
Caroline Sarojini Hart (Sat,) studied this question.