Assignment of code and mobilisation centre
3.—(1)  The competent authority may, by letter served in accordance with paragraph (2), assign to an owner of a chattel or a person having the possession, control or custody of the chattel any code or codes in words, figures or symbols and an equipment marshalling area in relation to any chattel specified in that letter.
(2)  The letter referred to in paragraph (1) may be served —
(a)in the case of an owner or person who is an individual, by delivering it personally or sending it by registered post addressed to that owner or person at his usual or last known place of residence or business; and
(b)in the case of a firm, company or corporation, by delivering it personally to any partner, director, manager or secretary of the firm, company or corporation, as the case may be, or by sending it by registered post addressed to that firm, company or corporation at its principal place of business or registered office.
(3)  The competent authority may, by letter served in accordance with paragraph (2), vary or revoke any code or codes or any equipment marshalling area assigned under paragraph (1).