Article 14 Notice of the hearing
The chair shall cause the appellant and the respondent to be given written notice of the date, time and place of the hearing at least 20 working days, or such shorter period as may with the agreement of both parties be determined, before the date of the hearing.
Where—
the appellant is relying on the ground of appeal set out in rule 4(4)(b) or 5(6)(b); and
either the appellant or the respondent (or both) have proposed witnesses under rule 9,
the chair shall determine which, if any, witnesses shall give evidence at the hearing.
No witness shall give evidence at the hearing unless the chair reasonably believes that it is necessary for the witness to do so, in which case the chair shall—
where the witness is a police officer, cause that person to be ordered to attend the hearing; and
in any other case, cause the witness to be given notice that his attendance is necessary and of the date, time and place of the hearing.