The most straightforward way to ensure this is to leave funds and arrange it with your solicitor (or prepay it with a funeral director) and then have a sheet of A4 stapled to your fridge door saying ' In the even of my death please contact:- and then whoever it is that you have arranged it with'.
A lady in our village has done exactly that ( quite weirds people out when they go in her kitchen), although the chances of someone dying 'round here without the village gossips spotting them is pretty remote anyway.