@CANK
Yes the post is a little brief on argument, mainly because the issue revolves around the concept of big "database".
In detail, this database will provide a "hub" to link several other databases, allowing some 330,000 people access to details as arcane as whether a childs parents have a drink problem.

The original idea was rolled out to try to help early intervention for vulnerable or at-risk children, but the latest "pitch" on it is more to do with information gathering per se. As the information commisioner said "If you wanted to find a needle, why build a bigger haystack?"