1. a) Corresponding author, Investing in Children, Durham, UK, liam.cairns@investinginchildren.net
2. b) School of Law and Social Justice, University of Liverpool, UK, Seamus.Byrne@liverpool.ac.uk
3. c) Moray House School of Education, University of Edinburgh, Scotland, UK, john.davis@ed.ac.uk
4. d) Investing in Children, Durham, UK, robert.johnson@investinginchildren.net
5. e) Moray House School of Education, University of Edinburgh, Scotland, UK, kkonstan@exseed.ed.ac.uk
6. f) Moray House School of Education, University of Edinburgh, Scotland, UK, marlies.kustatscher@ed.ac.uk