When someone dies their general practitioner will need to examine the body and determine the cause of death. The doctor will write a cause of death certificate which details the time, location and reason for the death. If the death is unexpected, suspicious or can’t be easily explained you should call the police and they will refer the case to the coroner for an investigation.
Once the cause of death certificate is written up it can be used to record the death with the registry of births, deaths and marriages and obtain an official death certificate.