(1) This section applies to an oral hearing before an adjudication officer under section 15U.
(2) An adjudication officer may, by notice in writing -
(a) summon a witness (including an authorised officer) to appear to give evidence, or to produce before the adjudication officer any books, documents or records in such person's power or control, or to do both, and
(b) require the witness to attend an oral hearing from day to day unless excused, or released from further attendance, by the adjudication officer.
(3) An adjudication officer may require evidence to be given on oath, and may for that purpose -
(a) require a witness to take an oath, and
(b) administer an oath to the witness orally or permit the witness to affirm.
(4) The oath to be taken by a witness for the purposes of this section is an oath that the evidence the witness will give shall be true.
(5) The adjudication officer may allow a witness at the oral hearing to give evidence by tendering a written statement, provided suc
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