Documents to be supplied to the senior officer concerned
13.—(1) Where a senior officer is given notice under regulation 11, he shall, at least 21 days before the date of the hearing referred to in that notice, be notified of the date, time and place of the hearing and be supplied with copies of—
(a)any statement he may have made under regulation 8 or 9;
(b)any relevant statement, document or other material obtained during the course of the investigation.
(2) In this regulation any reference to a copy of a statement shall, where it was not made in writing, be construed as a reference to a copy of an account thereof.