This is the accepted manuscript. This is a non-final version of an article published in final form in European Journal of Emergency Medicine. The final version is available from Wolters Kluwer at http://journals.lww.com/euro-emergencymed/Citation/publishahead/Difference_between_how_ambulance_service_personnel.99454.aspx. ; The research was funded by the National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care East of England at Cambridgeshire and Peterborough NHS Foundation Trust.