(1) The general rule is that a claim will not fail because a person —
(a) who should have been made a party was not made a party to the proceedings; or
(b) was added as a party to the proceedings who should not have been added.
(2) However —
(a) where a claimant claims a remedy to which some other person is jointly entitled, all persons jointly entitled to the remedy must be parties to the proceedings, unless the court orders otherwise; and
(b) if any such person does not agree to be a claimant, that person must be made a defendant, unless the court orders otherwise.
(3) This rule does not apply in probate or administration proceedings.
• Rules 67.2 and 68.3 deal with parties in such proceedings.