If these Rules require a document other than a claim form to be served on any person it may be served by any of the following methods —
(a) any means of service in accordance with Part 5 and Part 5A;
(b) leaving it at or sending it by prepaid post to any address for service in accordance with rule 6.3(1); or
(c) other means of electronic communication if permitted by a relevant rule or practice direction,
unless a rule otherwise provides or the court orders otherwise.