It is my understanding that the participants' will have allowed access to their medical records as part of this trial and presumably these records will have been updated as the trial progressed. These trials took place in an NHS hospital setting so this data will ultimately be available (although not in a nice, neat, ready to use form) under care.data anyway.
For those of you not in the UK: care.data has 2 parts. One allows the uploading of your GP's medical records. You can opt out of this part. The 2nd part consolidates all of your hospital records and stores them in one place. You have no choice here. Pseudo-anonymized data can then be sold to anyone who wants it- without your knowledge or permission - because it is pseudo-anonymized the data protection act doesn't cover it.
Now the thing with pseudo-anonymized data is that if you buy several datasets that include records from the same person /people it is possible to identify them.
So, it is possible this data will be available for a price anyway. If you are motivated enough to figure out and buy appropriate datasets.
Anyone who wants to know more about care.data:
http://www.care-data.info/
It is possible I am mistaken in this but I don't think so...