I have made a file called `dying tidy` I was always the one who dealt with all financial affairs, then I became widowed and did probate. Probate opened my eyes about how important it is to have all the details in one place. My AC would not have a clue about where to look
I have two good zipped conference folders, one contains all the day to day stuff like car details, energy suppliers etc The other contains the extra things like pensions, bank accounts, insurances, my will and POA etc. Both these folders are in a medium sized suitcase plus some cash, enough for immediate expenses. Some things need immediate payment eg death certificates and executors have expenses eg travel.
These folders both have index cards so everything is easy to access and anything that needs a phone number has that number written on it