Service of notices
23.—(1)  A notice or other document required to be served on any person under these Regulations may be served on such person either personally, by registered post or by ordinary post and to the last known address of such person.
(2)  Where a person to whom there has been addressed a registered letter containing any notice which may be given under the provisions of these Regulations is informed of the fact that there is a registered letter awaiting him at a post office and he refuses or neglects to take delivery of the letter, the notice shall be deemed to have been served upon him on the date on which he was informed that there was a registered letter awaiting him at the post office.