(1) When an election petition complains of an undue return and claims the seat for some person other than the person returned, the respondent may, within 10 days after the service of the notice of the election petition, give notice as set out in Form 20 of the Schedule to the petitioner that he or she intends to give evidence to prove that the person on whose behalf the seat is claimed was not elected.
(2) The grounds on which a respondent intends to complain that a person on whose behalf the seat is claimed was not duly elected must be set out in the notice under subrule (1) and rule 4 applies to the notice.