[davemac]

I think the bigger risk comes from people hacking the system and then passing it to all and sundry. Hacking into systems harder to crack than the NHS database has occurred, and still does, so any information we put onto computers is liable to be shared, even stuff we keep on our own systems can be accessed by a determined hacker, and most people don't know it has occurred, botnet systems being just one way we are duped.