Data Protection Act, 1988
Service of notices.
25.—Any notice authorised by this Act to be served on a person by the Commissioner may be served—
(a) if the person is an individual—
(i) by delivering it to him or
(ii) by sending it to him by post addressed to him at his usual or last-known place of residence or business, or
(iii) by leaving it for him at that place,
(b) if the person is a body corporate or an unincorporated body of persons, by sending it to the body by post to, or addressing it to and leaving it at, in the case of a company, its registered office (within the meaning of the Companies Act, 1963 ) and, in any other case, its principal place of business.