I posted this elsewhere within the community in another thread, and thought it worthwhile reproducing it as a stand-alone topic. For those who have heard of the 'Living Will' the 'Advance Decision' is the more recent equivalent. It must be made whilst you are of sound mind.
'I have an 'Advance Decision' which I very carefully put together nearly ten years ago. It defines the conditions where I do not want medical intervention should I become very seriously incapacitated. I discussed this with my family and my GP at the time, and it is independently witnessed and a copy is with my GP. I consider the 'Do Not Resuscitate' is too easy to misinterpret. I urge everyone who may be faced with this situation to consider getting an Advance Decision prepared, as I did. It's your life that you may wish to sustain, or conversely allow to slip away if the circumstances dictate, and sometimes the medical profession have a conflict of interest in dealing with some end of life situations, as I found out when my elderly mother, who had several serious health conditions including Alzheimers, was 'saved' after what was possibly a major stroke which caused her to lose consciousness, by a well meaning doctor who though she was doing the right thing when in fact she wasn't, a point of view which I very robustly put forward to those responsible, although in the end my mother never recovered consciousness after several weeks and was allowed to slip away.
For those who want to know more about the Advance Decision there are several UK based health organisations who have webpages devoted to this e..g Age UK, and some with pro formas to use and modify as you feel appropriate.