 Confidentiality breech is extremely unlikely, as all information will be stored on NHS National Health Service trust computers, however the investigators acknowledge this risk. Only clinicians involved in patient care or researchers from within the study team will have access to patients clinical details. Patients will be consented to allow non-clinical members of the research team university staff access to essential information for the study; however this information will be kept to an absolute minimum. For example, if a researcher performs the pinch-grip test, it is fair to assume that researcher will become aware that the patient has a diagnosis of CTS. Patients will have been consented for this. 