You seem to think that the NHS is releasing all this information.
It is not.
GPs send this "pseudo-anonymous" information to HSCIC. The HSCIC needs the extra information to create statistically useful cohorts. The HSCIC control access to that data. The HSCIC do some of their own statistics work and they release the results (but not the data sets!) which are often reported in UK news. Researchers, after being assessed, get access to anonymised sets of data. Researchers do not get all the information, but get an anonymised version of the pseudo anonymous data.
Note that reports released are also carefully anonymised.
You also seem to think that your GP holds your full medical history which is laughably wrong.
It is not.
GPs send this "pseudo-anonymous" information to HSCIC. The HSCIC needs the extra information to create statistically useful cohorts. The HSCIC control access to that data. The HSCIC do some of their own statistics work and they release the results (but not the data sets!) which are often reported in UK news. Researchers, after being assessed, get access to anonymised sets of data. Researchers do not get all the information, but get an anonymised version of the pseudo anonymous data.
Note that reports released are also carefully anonymised.
You also seem to think that your GP holds your full medical history which is laughably wrong.
Start here: http://www.hscic.gov.uk/patientconf