To maximise the research response of the sample of teachers, we arranged with the heads of every school involved in the research to have informal meetings with the selected teachers at their place of work. The purpose of all the meetings was to explain the objective and background of the study, to inform the individual respondents that they had a personal choice about whether or not they took part, to answer any queries or apprehensions, and to assure the interviewees of anonymity and confidentiality in the content of the interview.