12.—(1) All notices required or authorised by or under these Regulations to be given, sent or delivered must be in writing, unless it is otherwise provided, or the court allows the notice to be sent or given in some other way.
(2) Any reference in these Regulations to giving, sending or delivering a notice or any such document means, without prejudice to any other way and unless it is otherwise provided, that the notice or document may be sent by post, and that, subject to paragraph 13, any form of post may be used. Personal service of the notice or document is permissible in all cases.
(3) Where under these Regulations a notice or other document is required or authorised to be given, sent or delivered by a person (“the sender”) to another (“the recipient”), it may be given, sent or delivered by any person duly authorised by the sender to do so to any person duly authorised by the recipient to receive or accept it.
(4) Where two or more persons are acting jointly as the British insolvency officeholder in proceedings under British insolvency law, the giving, sending or delivering of a notice or document to one of them is to be treated as the giving, sending or delivering of a notice or document to each or all.