Two studies of a mindfulness training programme are presented. Study 1 reports on a pilot investigation of the impact on well-being of the Breathworks mindfulness-based pain management programme. Significant positive change was found on self-report measures of depression, outlook, catastrophizing and pain self-efficacy in the Intervention Group, but not the Comparison Group. Particularly large effects were found for pain acceptance. These results support the short-term efficacy of the Breathworks programme and reinforce the importance of acceptance for positive outcome with chronic pain patients. Study 2 investigated alterations in mindfulness following participation in the Breathworks programme. Subjective and nonsubjective measures of mindfulness were used. Scores on the Mindful Attention Awareness Scale were signifi cantly higher at Time 2 in the Intervention Group, but not in the Comparison Group. There was no change on a measure of sustained attention. Results from an Implicit Association Test provided some support for an increased awareness of positive stimuli, following the intervention. These results are discussed with reference to the mechanisms of mindfulness.