9.3—(1) Where a document to which rule 2.9 applies is required to be served on a person under disability within the meaning of the last foregoing rule, it shall be served—
(a)in the case of a minor who is not also a patient, on his father or guardian or, if he has no father or guardian, on the person with whom he resides or in whose care he is;
(b)in the case of a patient—
(i)on the person (if any) who is authorised under Part VII to conduct in the name of the patient or on his behalf the proceedings in connection with which the document is to be served, or
(ii)if there is no person so authorised, on the Official Solicitor if he has consented under rule 9.2(4) to be the guardian ad litem of the patient, or
(iii)in any other case, on the person with whom the patient resides or in those care he is:
Provided that the court may order that a document which has been, or is to be, served on the person under disability or on a person other than one mentioned in sub-paragraph (a) or (b) shall be deemed to be duly served on the person under disability.
(2) Where a document is served in accordance with paragraph (1) it shall be indorsed with a notice in Form M24; and after service has been effected the person at whose instance the document was served shall, unless the Official Solicitor is the guardian ad litem of the person under disability or the court otherwise directs, file an affidavit by the person on whom the document was served stating whether the contents of the document were, or its purport was, communicated to the person under disability and, if not, the reasons for not doing so.