(1) A coroner may exercise the powers specified in this section if the coroner—
(a) believes it is necessary for the purposes of an inquest; or
(b) considers it may help to determine whether or not to hold an inquest.
(2) A coroner may—
(a) summon a person to attend as a witness or to produce any document or other materials;
(b) inspect, copy and, subject to this Act and the rules, hold for a reasonable period any thing produced at the inquest;
(c) order a witness to answer questions;
(d) exclude a person or class of person from an inquest;
(e) give any other directions and do anything else the coroner believes necessary.
(3) A summons under subsection (2) must be in the prescribed form.