Where appropriate the chief investigator or the research assistant will ask the patient if they would be willing to be contacted by the chief investigator the following day to discuss the study further. If so the patient details will be passed to the chief investigator who will call the patient at least 24 hours after the introduction of the study. The chief investigator will call to discuss the study further and if the patient is happy to participate an appointment will be arranged for the patient to attend the physiotherapy department of either Worthing or Southlands hospital. At this time informed consent, eligibility assessment and baseline outcome measurement will be performed. In addition baseline characteristics will be recorded in an attempt to minimize selection bias. The estimated time for this visit is 90 minutes.