It would appear that the NHS Opt out form provided here on 18th May is not
sufficient to stop your private medical data being shared with third parties. An
additional one is needed that isn’t too easy to find on line.
It may be
downloaded here complete with its myriad of typos and the repeated incorrect spelling of dependant.
If you are concerned about NHS data harvesting the Opt Out form needs to get to your GP by the 23rd June.