8. Economic evaluation Investigators will assess the use of health care resources, costs to the NHS and costs to patients and their carers in the two groups. Data on resource use in tertiary, secondary and primary care will be collected. Data on resources used for outpatient consultations (telephone or face-to-face), additional or unscheduled hospital visits, tests and procedures, drug prescriptions, hospital admissions, and general practice visits will be identified for every patient.