I can't think of a legitimate reason for there being identifiable records available for non-care purposes.
For any data mining or research purposes the first half of the postcode should be accurate enough and even that should only be released if deemed necessary.
What I have read about the scheme causes much concern, there seems lots of scope for privacy breaches. I have opted out although I understand this is a pretty feeble action to take - the records are still being uploaded and will still be accessible.