Over recent years, specialist breast care nurses have become increasingly recognized as core members of any breast care team within the UK. Part of the role is to support patients at the highly stressful stage of receiving a diagnosis. This paper describes an 'advocacy' style of nurse counsellor intervention which aims to improve patients' preparation for, and involvement in, the diagnostic consultation and provides a framework for future counselling support. One hundred and three women undergoing surgery following diagnosis of breast cancer or a benign breast lump were supported using either this advocacy intervention or a more conventional model of care. The aim was to identify the most effective and appropriate method of intervening at this important stage. Assessment took place before surgery, with 2-week and 6-month follow-ups, and included the Hospital Anxiety and Depression Scale, Rotterdam Symptom Check List and semi-structured interviews addressing perceived quality of care, involvement in decision-making and psycho-social functioning. Whilst the results of many measures were similar for women in the two intervention groups, qualitative data support the implementation of the advocacy method by the breast care nurse.