(1) The general rule is that any fact which needs to be proved by evidence of witnesses is to be proved at —
(a) trial, by their oral evidence given in public; and
(b) any other hearing – by affidavit.
(2) The general rule is subject to any —
(a) order of the court; and
(b) provision to the contrary contained in these rules or elsewhere.
(3) Any evidence taken at the trial or other hearing of any proceedings may be used subsequently in those proceedings.
• Part 30 deals with affidavits.