Re: A note on "anonymous" data
Not a problem. Care.data will have to anonymise it. The GP practice has no say, the entire data set is downloaded from the practice: All of it. The patient "opt-out" only comes into play at the HSCIC.
Note that it will be illegal for the practice to allow the data to be captured against the data subjects instructions (DPA), AND illegal for them to not allow it to be captured (H&SCR act)
Heads they lose: Tails they lose.