Paragraph 1(i) shall not apply unless —
(a) the research purpose cannot reasonably be accomplished unless the personal data is provided in an individually identifiable form;
(b) it is impracticable for the organisation to seek the consent of the individual for the use;
(c) the personal data will not be used to contact persons to ask them to participate in the research; and
(d) linkage of the personal data to other information is not harmful to the individuals identified by the personal data and the benefits to be derived from the linkage are clearly in the public interest.