6.—(1) A notice or other document is served on a person in accordance with this regulation if it is set out in writing and —
(a)delivered to that person;
(b)left at the person's proper address;
(c)sent by post to that address; or
(d)sent to the person at that address by fax or other similar means which produce a document containing a text of the communication, in which event the document is regarded as served when it is received.
(2) In paragraph (1), “proper address” means in the case of—
(a)an individual, that person's usual or last known place of business, employment, or residence;
(b)a body corporate, its principal or registered office or its principal place of business;
(c)a limited liability partnership, the address of its principal or registered office; or
(d)a partnership or an unincorporated body or association, its principal office or principal place of business.