Until recently, if I died suddenly, I think very soon all utilities would have been turned off in quick succession as she doesn't have a clue who our suppliers are. Sad, but this did play on my mind and I recently wrote all this crap down and put it in a "safe place" so she would know which companies to ring up if needed.
Same with banking, insurance and mortgage-type stuff.
You can imagine that it's an entralling one-page document to read.
I have to do this...I went in for an operation recently and got all the life insurance papers out before hadn because I knew that he didn't have a clue where they were.