3.—(1) Where the Registrar is to conduct a hearing to determine a matter under rule 299 of the principal rules he must serve a notice of his intention to hear on all parties to the dispute. Such notice must name the parties to the proceedings and must include, in a form approved by the Registrar, guidance relating to the rules of evidence and procedure which apply to the hearing. The notice must also inform the parties of the time and place of the hearing.
(2) When he receives the notice of intention to hear, a party must notify the Registrar whether or not he intends to attend or be represented at the hearing and whether or not he intends to call witnesses.
(3) If a party does not intend to attend or be represented at the hearing, he may send to the Registrar written representations in support of his contentions.
4. —At any oral hearing, a party may conduct his case himself or may appear and be represented or assisted by any person whether or not legally qualified:
Provided that if in any particular case the Registrar is satisfied that there is sufficient reason for doing so, he may refuse to permit a particular person to represent or assist a party at the hearing.