Hi Phil
I have a Medic Alert bracelet, which also comes with a small credit card info leaflet.
My reason for using this system is that the bracelet clearly displays my diagnosis, stem cell transplant ,risk of GVHD ( graft versus host disease if given non- irradiated blood) and my allergies.(11 words total) with my registration number in the UK and the telephone number to contact Medic Alert from anywhere in the world.
They hold all your information on a central data base, including Consultant and Hospital attending and General Practitioner. I chose this system as I hopefully will be spending lots more time in Spain and travelling to spend time with our daughter in New Zealand, and Medic Alert in known internationally.
I work on the premise of better safe than sorry, but if you are not planning on travelling a local system might be OK for you.
Hope this helps,
Carol