(1) Where the court has not appointed a next friend, a person who wishes to act as next friend must follow the procedure set out in this rule.
(2) A person authorized under the Act must file an official copy of the order or other document which constitutes that person's authorisation to act.
(3) Any other person must file a certificate that that person satisfies the conditions specified in rule 23.6.
(4) A person who is to act as a next friend for a claimant must file the —
(a) authorisation; or
(b) certificate under paragraph (3),
at the time when the claim is made.
(5) A person who is to act as a next friend for a defendant must file the —
at the time when the next friend first takes a step in the proceedings on behalf of the defendant.
(6) The next friend must —
(a) serve a copy of the certificate under paragraph (3) on every person on whom in accordance with rule 5.10 (service on minors and patients) the claim should be served; and
(b) file an affidavit of service.