Matrimonial Causes Act 1965

4 Alleged adulterer as a party

(1) On a petition for divorce presented by the husband on the ground of adultery, or in the answer of a husband praying for divorce on that ground, the husband shall make the alleged adulterer a co-respondent unless excused by the court on special grounds from doing so.

(2) On a petition for divorce presented by the wife on the ground of adultery the court may, if it thinks fit, direct that the alleged adulteress be made a respondent.

(3) Where an alleged adulterer is made a co-respondent on such a petition as is mentioned in subsection (1) of this section or an alleged adulteress is made a respondent on such a petition as is mentioned in the last foregoing subsection, the court may, after the close of the evidence on the part of the petitioner, direct that the co-respondent or, as the case may be, the respondent be dismissed from the suit if the court is of opinion that there is not sufficient evidence against him or her.