Aim: Professional therapy organisations promote the importance of working with difference, yet subtle negative biases towards lesbian, gay, and bisexual (LGB) clients continue. Issues of competence in this area have only recently been addressed. This research aims to study the effectiveness of training to support therapists working with LGB clients in Britain. Method: Students (past and present) of an integrative counselling diploma course completed questionnaires including: background details, a Sexual Orientation Counselor Competence scale (Bidell, 2005), and two qualitative questions about previous learning relating to LGB issues. Quantitative analysis utilising a one way ANOVA test was used to compare the levels of competence at different times in training, and grounded theory to analyse the qualitative responses. Results: Results show that students have a high level of awareness, although a lower level measured in year two of the programme. The qualitative results indicate the learning value of personal experiences. Further themes describe the ways in which students learnt about LGB issues. Discussion: The reduction in scores for awareness may indicate that training facilitates a deeper understanding of self. Key themes indicate the importance of challenging old internal working models of sexual orientation. Implications for practice: The results will enable competences and effective learning experiences to be mapped in the curriculum.