The eventual aim of this series of studies is to assess the interaction between acute psychological problems and post-surgical pain and the impact that this has on longer-term outcomes such as CPSP, mood and quality of life. Short-term pre- and post-operative psychological interventions will then be developed to modify the impact of psychological factors on long-term surgical outcomes. Further studies will assess the efficacy of these interventions. Pre-study audit will be carried out to confirm the feasibility of matching.