reg 7 Service on other individuals
Where under these Rules any document is to be served on an individual other than a person to whom proceedings relate, the registrar or a person mentioned in rule 6, it may be served— (a) on the individual personally; (b) if he is subject to service law, by post in a letter addressed to him at his unit; (c) if he is not subject to service law— (i) by leaving it at his usual or last known place of abode; or (ii) by post in a letter addressed to his usual or last known place of abode.