reg 12 Proof of service
(1) Where— (a) under any of rules 4 to 8 or a direction under rule 9, 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 11 the document shall be assumed to have been despatched, left or transmitted on that day, unless the contrary is shown.