(1)For the purposes of section 4 of this Act a notice of cancellation—
(a)shall be deemed to be served on the owner or seller if it is sent by post addressed to a person specified in a statement contained either in the first statutory copy or in the second statutory copy of the relevant document as being a person to whom such a notice may be sent, and is addressed to that person at an address so specified, and
(b)where the preceding paragraph applies, shall be deemed to be served on the owner or seller at the time when it is posted.
(2)The preceding subsection shall have effect without prejudice to the service of a notice of cancellation (whether by post or otherwise) on the owner or seller, or on such a person as is mentioned in section 4(2)(b) of this Act, in any way in which the notice could be served apart from the preceding subsection.
(3)A notice of cancellation which is sent by post to a person at his proper address, otherwise than in accordance with subsection (1) of this section, shall be deemed to be served on him at the time when it is posted.
(4)So much of section 26 of the Interpretation Act 1889 as relates to the time when service is deemed to have been effected shall not apply to a notice of cancellation.