The study plans to recruit patients at a pre admission clinic where patient's baseline clinical data will be collected. They will also be provided with questionnaires to complete before the end of the clinic. This is to evaluate the participant's pre operative mood, cognitive status and social orientation. During their hospital stay following surgery the participants will be assessed routinely for delirium. If they are known to have suffered from delirium, they will be enrolled to phase 2 of the study.