Rapid Access Chest Pain Clinics have improved the diagnosis and treatment of patients with coronary heart disease and angina. Despite this, coronary heard disease continues to be under diagnosed and many patients are left untreated and at risk. Recently computed tomography (CT) ofthe heart arteries has become available and this could be a much better way of diagnosing heart disease. Here we propose to assess the added value of CT imaging inover 4,000 patients attending rapid access chest pain clinics across Scotland. This study could revolutionise how we diagnose heart disease in the future and potentially save lives.