This article reports on the findings of a study looking at the role of the school-based mentor in developing the competence of trainee teachers in relation to the use of information and communications technology (ICT) in the classroom. One key factor in determining the contribution of the mentor appears to be the level of confidence in his/her ability to use ICT, both personally and in the classroom, which in turn has an effect on both the nature and range of the support given to the trainee teacher. Questionnaire and interview data indicated that many mentors feel that their ICT expertise is often not as great as that of the trainee (and therefore feel less confident and/or willing to offer guidance in this area) and that they are unable to offer support to trainees in relation to contexts that involve the use of ICT in the classroom. The authors would suggest that traditional approaches to mentoring might need to be reviewed in the light of this and they would argue that there could be benefits from adopting more innovative ways of working whereby the trainee's ICT knowledge and skills might be used to full effect when combined with the mentor's understanding of classroom teaching and learning. Such a model has implications for the providers of initial teacher training and these are discussed. (Contains 3 tables and 2 notes.)