From the other thread....
Don't panic Captain Mainwaring. The Elders and HLC only have the power over you that you give them. Don't sign it. Don't talk to the elders about it. If they chase you at all it will be once or twice. Just tell them you'll sort it out. They will forget about it. Without this document the HLC can do bugger all.
It's not a bad idea to make your wishes clear in a document and conversation with your doctor but most elders don't have the time or inclination to keep track of who and who has not logged a blood card with them. Not only that but the fact the document is limited to so called primary components means loads of questions from old sisters about what they can and can't have. The elders will be glad of not being hassled by you
Remember as well this is only a document for the UK. Wording and mileage may differ elsewhere.