Where two people register as civil partners of each other in Northern Ireland, the civil partnership is voidable if—
either of them did not validly consent to its formation (whether as a result of duress, mistake, unsoundness of mind or otherwise);
at the time of its formation either of them, though capable of giving a valid consent, was suffering (whether continuously or intermittently) from mental disorder of such a kind or to such an extent as to be unfitted for civil partnership;
at the time of its formation, the respondent was pregnant by some person other than the applicant;
an interim gender recognition certificate under the Gender Recognition Act 2004 (c. 7) has, after the time of its formation, been issued to either civil partner;
the respondent is a person whose gender at the time of its formation had become the acquired gender under the 2004 Act.
In this section and section 175 “mental disorder” has the same meaning as in the Mental Health (Northern Ireland) Order 1986 (S.I. 1986/595 (N.I. 4)).