30.—(1) Any document required or authorised by these Regulations to be served on a person may be so served—
(a)by delivering it to him or by leaving it at his proper address or by sending it by post to him at that address;
(b)if the person is a body corporate, by serving it in accordance with sub-paragraph (a) on the secretary or clerk of that body corporate; or
(c)if the person is a partnership, by serving it in accordance with sub-paragraph (a) on a partner or on a person having control or management of the partnership business.
(2) For the purposes of paragraph (1), and for the purposes of section 7 of the Interpretation Act 1978(1) (which relates to the service of documents by post) in its application to that paragraph, the proper address of any person on whom a document is to be served in accordance with these Regulations shall be his last known address except that—
(a)in the case of service on a body corporate or its secretary or clerk, it shall be the address of the registered or principal office of the body corporate; and
(b)in the case of service on a partnership or a partner or a person having the control or management of a partnership business, it shall be the principal office of the partnership,
and for the purposes of this paragraph the principal office of a company registered outside the United Kingdom or of a partnership carrying on business outside the United Kingdom is its principal office within the United Kingdom.