Jetjr,
The blurb also says that A&E departments in hospitals will have an override code to give them access without your PIN. How long, do you suppose, will it take for the bad guys to have this code given that literally thousands of health workers in all the A&E departments in this country will legitimately have this code available? An SMS is not much use after the event.
Should you have a medical condition, type 1 diabetes comes to mind, ensure that you wear a medic alert wristband or neck chain. You can even get a tattoo, some of my pals have neat T1 ink.