14.—(1) Where—
(a)under any of rules 5 to 9 or a direction under rule 10, a document may be served by a particular method, and
(b)a certificate is produced which—
(i)states that the document was so served, and
(ii)is signed by a person who purports to have so served the document,
the document shall be assumed to have been so served, unless the contrary is shown.
(2) Where a certificate is produced which—
(a)states that a document was despatched, left at a DX box number or transmitted on a particular day, and
(b)is signed by a person who purports to have despatched, left or transmitted the document,
for the purposes of rule 13 the document shall be assumed to have been despatched, left or transmitted on that day, unless the contrary is shown.
(3) This rule is subject to any provision requiring proof on oath.