34. Postal delivery of documents

(1) A document is delivered if it is sent by post.
(2) Unless the contrary is shown —
(a) a document sent by post is treated as delivered on the third business day after the day on which it is posted; and
(b) where a post-mark appears on the envelope in which a document was posted, the date of that post-mark is to be treated as the date on which the document was posted.
(3) In this rule "post-mark" means a mark applied by a postal operator which records the date on which a letter entered the postal system of the postal operator.