Behavioural Activation (BA) can be as effective as Cognitive Behaviour Therapy (CBT) for the treatment of depression in adults, but to date, there is little research with adolescents. This is problematic given the recognised need to increase access to evidence based interventions for depression in young people. We have developed a new adaptation of Brief Behavioural Activation (Lejuez, Hopko, Acierno, Daughters, Pagoto, 2011) specifically for young people; Brief Behavioural Activation for depressed adolescents (Brief BA). In this paper we use a case example with session by session measurement to show how a non-specialist clinician can deliver this intervention successfully. We discuss the key themes arising from this training case, challenges the clinician faced, and how these were managed through training and supervision.