336.This section establishes wider powers for investigators appointed to investigate possible insider dealing, market abuse, misleading statements and practices or a breach of the general or the promotional prohibitions under sections 19, 21 or 238.  Because these are liable to focus, at least initially, on market circumstances rather than the conduct or circumstances of any particular person, or the activities of persons unknown, there is no requirement to notify a particular person as the subject of the investigation.  So the concept of connectedness does not apply.  The investigator can require any person to attend and answer questions, or to supply information or documents, so long as the investigator considers that they may be able to give information relevant to the investigation.
Commentary on Sections Part Xi: Information Gathering & Investigations Section 173: Powers of persons appointed as a result of section 168(2)