4.—(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 at or by leaving it at—
(i)the address provided by that person in accordance with these Regulations, or
(ii)his proper address;
(b)by sending it by post to him at either of the addresses mentioned in sub-paragraph (a);
(c)where the person is a partnership, by serving it in accordance with sub-paragraph (a) or (b) on a partner or on a person having control or management of the partnership business;
(d)where the person is a body corporate, by serving it in accordance with sub-paragraph (a) or (b) on the secretary or clerk of that body corporate; or
(e)where the person is an unincorporated body, by serving it in accordance with sub-paragraph (a) or (b) on a person having control or management of that body.
(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 will be his last known address except that—
(a)in the case of service on a partnership or a partner or a person having the control or management of a partnership business, it will be the principal place of business in the United Kingdom of the partnership;
(b)in the case of service on a body registered in the United Kingdom or its secretary or clerk, it will be the address of the registered office or principal place of business in the United Kingdom of the body; and
(c)in the case of service on a body that is not registered in the United Kingdom, it will be the address of the principal place of business in the United Kingdom of the body.