Ruddy Amber
Not all of us "impatiently agree" to overreaching cookie policies. If a website does not allow me to opt out of tracking (btw referring me to Google does not count) and is not vital then I close the browser window. I can and will find that information from a site that is not breaking the law.
By tying some kind of ID system to NHS numbers all you will achieve is to HARM the health of the nation. Some people will avoid doctors and hospitals even if very ill so that they are not tracked by this totalitarian scheme.