The evidence-based Incredible Years Teacher Classroom Management (TCM) Programme was developed to meet demands from teachers for strategies to manage disruptive behaviours in the classroom (Webster-Stratton, 1999). This paper describes the programme and reports on its first use in the UK. In the first study 23 teachers attended the five-day classroom management programme, 20 completed the final satisfaction questionnaire and 21 participated in a semi-structured follow-up interview. Teachers who implemented the training in their classrooms reported satisfaction with the programme and believed that the strategies taught were effective and improved pupils’ conduct. In the second study, blind observation of teacher classroom behaviour was undertaken in 21 classes, 10 teachers had received the TCM training and 11 had not. Teachers who received TCM training gave clearer instructions to children and allowed more time for compliance before repeating instructions. The children in their classes were more compliant than children in the classes of untrained teachers. The implications of these findings are discussed.