20.—(1) Any notice or other document required or authorised to be given to, or served on, any person under these Regulations may be given or served by—
(a)delivering it to that person;
(b)leaving it at his proper address; or
(c)sending it to his proper address by the post.
(2) Any notice or other document required or authorised to be served on, or given to, any body corporate or unincorporated association other than a partnership shall be duly given to, or served on, the secretary or clerk or other similar officer of that body.
(3) Any notice or other document required or authorised to be served on, or given to, any partnership (including a Scottish partnership) shall be duly given or served on, or given to, a partner or a person having the control or management of the partnership business.
(4) For the purpose of this regulation, the proper address of any person on whom or to whom any such notice or document is to be served or given shall be his last known address except that such address shall be—
(a)in the case of a body corporate or their secretary or clerk, the address of the registered office or principal office of the body corporate;
(b)in the case of an unincorporated association (other than a partnership) or their secretary or clerk, the address of the principal office of the association; and
(c)in the case of a partnership (including a Scottish partnership) or a person having control or the management of the partnership business, the address of 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 shall be its principal office within the United Kingdom.