12.4.—(1) All notices required or authorised by or under the Act or the Rules to be given must be in writing, unless it is otherwise provided, or the court allows the notice to be given in some other way.
(2) Where in any proceedings a notice is required to be sent or given by the official receiver or by the responsible insolvency practitioner, the sending or giving of it may be proved by means of a certificate—
(a)in the case of the official receiver, by him or a member of his staff, and
(b)in the case of the insolvency practitioner, by him, or his solicitor, or a partner or an employee of either of them,
that the notice was duly posted.
(3) In the case of a notice to be sent or given by a person other than the official receiver or insolvency practitioner, the sending or giving of it may be proved by means of a certificate by that person that he posted the notice, or instructed another person (naming him) to do so.
(4) A certificate under this Rule may be endorsed on a copy or specimen of the notice to which it relates.