21.— (1) A notice or notification by the Minister under this Act or for the purposes of the EU Regulations shall be in writing and addressed to the person by name and shall be given to or served on the person in one of the following ways:

(a) by delivering it to the person;

(b) by leaving it at the address at which the person ordinarily resides or carries on business or, in a case in which an address for service has been given, at that address;

(c) by sending it by post in a pre-paid registered letter addressed to the person at the address at which the person ordinarily resides or carries on business or, in a case in which an address for service has been given, to that address;

(d) if an address for the service of a notice or notification has been furnished by the person, by leaving it at, or sending it by pre-paid registered post addressed to the person to, that address;

(e) if the person concerned has agreed to service of notices by means of an electronic communication (within the meaning assigned to it by section 2 of the Electronic Commerce Act 2000) to the person (being an addressee within the meaning assigned by that section), service by such means, but only if it is also given in one of the other ways mentioned in any of the preceding paragraphs.

(2) For the purposes of subsection (1), a company registered under the Companies Acts is deemed to be ordinarily resident at its registered office, and every other body corporate and every unincorporated body is deemed to be ordinarily resident at its principal office or place of business.