Delivery of summons to witnesses

Any summons to witnesses authorised or required to be issued under these Regulations shall be delivered to the person concerned personally or by registered post and in the latter case, in proving service, it shall be sufficient to prove that the summons was properly addressed to the person concerned at his ordinary or last known address: Provided that reasonable notice of the date, time and place of the hearing and of documents to be produced, if any, shall be given in the notice of summons.