Print out this form:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/422283/DJP__English_web_PDF_.pdf
Complete it. (Section 4 should be left blank apart from ticking either Box A or Box B: See below)
Send it, together the relevant document (depending upon whether Box A or Box B is marked : See below) to the Land Registry at this address:
Citizen Centre
PO Box 6350
Coventry
CV3 9LP
No fee is payable.
If the deceased person left a will then an official copy of the grant of probate should be sent with the form.
If they died intestate but their spouse obtained letters of administration in order to distribute their estate, then an official copy of the letters of administration should be submitted.
If they died intestate and letters of administration were not sought then an official copy of their death certificate, or a copy certified to be a true copy, should be sent.
If an original copy of the death certificate is required, it can be obtained for £9.25 from here:
https://www.gro.gov.uk/gro/content/certificates/default.asp
(That assumes that the deceased person lived in England or Wales).
Alternatively a certified copy can be obtained by taking an existing copy to a solicitor, who will charge a nominal fee for the service. (Unless it's gone up very recently, the fee is still set at the remarkably low figure of just five pounds).
Those procedures won't change any paper deeds (which are largely redundant anyway) but they will change the (all-important) title register at the Land Registry.