When my husband died i just did the appropriate form and sent it with a death cert IIRC.
I had to do a form DJP. I was a bit confused by what to do so i phoned up and asked. They were very nice and helpful and it was quite easy.
http://www.landregistry.gov.uk/public/when-a-property-owner-dies.
make sure you go to the .gov website, there are many similar websites that are commercial concerns and will charge you fees to do what you can do yourself