Just for future reference, if you tap Herbert Protocol into Google (other search engines are available!!), websites pop up for various counties/areas, which have the info and forms to download.
This looks so useful that I decided to save the file and fill it in with my own details, to keep with the Life Book that contains other stuff for my family should "anything happen to me". I discovered that I have a copy saved already. I don't remember downloading that and saving it - maybe it will come in useful sooner than I thought!