I’ve never heard of that bottle in the fridge thing but I live alone and I’ve got an iPhone I’ve got my blood type and all my medication my next of kin my drs allergies etc all in my iPhone anyone who is emergencies services can bypass your face id etc and get into your phone and read it all. After all you always have your phone on you and mine as being tested and help the ambulance crew.
Seems it’s now Harry’s uncle - the Earl of Spencer - having his turn at a “tell all” book.

