Section 4(1) and (2).
The first principle
(1) In determining for the purposes of the first principle whether personal data are processed fairly, regard is to be had to the method by which they are obtained, including in particular whether any person from whom they are obtained is deceived or misled as to the purpose or purposes for which they are to be processed.
(2) Subject to paragraph 2, for the purposes of the first principle data are to be treated as obtained fairly if they consist of information obtained from a person who -
(a) is authorised by or under any enactment to supply it, or
(b) is required to supply it by or under any enactment or by any convention or other instrument imposing an international obligation on the United Kingdom.
(1) Subject to paragraph 3, for the purposes of the first principle personal data are not to be treated as processed fairly unless -
(a) in the case of data obtained from the data subject, the data controller ensures so far as practicable