Service of notices
16. Any notice or other document to be sent, served or given under these Regulations may be sent, served or given either–
(a)by delivering it to the person on whom it is to be served or to whom it is to be given;
(b)by leaving it at the usual or last known place of abode of that person, or, in a case where an address for service has been given by that person, at that address;
(c)by sending it in a prepaid registered letter, or by the recorded delivery service, addressed to that person at his usual or last known place of abode, or, in a case where an address for service has been given by that person, at that address; or
(d)in the case of an incorporated company or body, by delivering it to the secretary or clerk of the company or body at its registered or principal office, or by sending it in a prepaid registered letter, or by the recorded delivery service, addressed to the secretary or clerk of the company or body at that office.