If you know any of your neighbour's friends or family, the first step should be to make a few enquiries with them to see if they know their whereabouts. You may want to contact the NHS or Ambulance Service if you think your neighbour is experiencing a medical emergency, medical episode, or your neighbour is suffering from ill health. If you think that your neighbour is a missing person or has been the victim of a crime you should contact the Police for advice.
Please also see the Right Care, Right Person website in Related Information.