When the Cause of Death Certificate has been issued, the Undertakers can take the deceased into their care, to enable the funeral arrangements to be made and the preliminary processes for applying for Probate, started.
However the Cause of Death Certificate is only an interim stage, and the death must be formally reported to the Registrar of Births Death & Marriages, within five days of the death.

This is done by personally taking the Cause of Death Certificate to the local Registrar so that a formal Death Certificate can be issued. (NB. It may be necessary to make an appointment with the Registrar for this purpose)

The Registrar will ask you to provide him/her with certain information, namely when and where the death took place, the date of the death and the home address of the deceased. In the case of a married woman her maiden name will be required. If a Birth Certificate and a Marriage Certificate are available for the deceased, take these along too, as while they are optional, having them with you will help.

The Registrar will issue the formal Death Certificate, a full version for use in the Probate process and a shorter version for the undertaker, to allow the funeral to take place.

However, because the death may need to be registered with a number of people/organisations, it is advisable to ask the Registrar to issue a few extra copies (certified copies), at this stage.

Financial institutions such as Banks and Insurance companies will probably require a certified copy of the death certificate to allow access to the accounts and funds of the deceased, by the Executors/Administrator, pending the grant of Probate/Letters of Administration.