If the death was expected, perhaps due to a terminal illness, you should contact the deceased’s GP or nearest doctor. If it happened during the night, you do not need to contact the doctor until the following morning unless you want to.
If the cause of death is known and from natural causes the doctor will issue the documents to allow you to register the death.
If the cause of death is unknown or is not natural, the coroner will investigate the death. This usually requires a post-mortem examination. You will be informed about this by the coroner’s office, who will also give you the results. If the death is found to be from a natural cause you will be told how to make an appointment to register the death.