421Amendment of complaint application

421 Amendment of complaint application (1) The ACAT may, on application by the relevant council or on its own initiative, amend an application to omit an allegation or to include an additional allegation, if satisfied that it is reasonable to make the amendment having regard to all the circumstances. (2) Without limiting subsection (1), in considering whether or not it is reasonable to amend an application, the ACAT must have regard to whether amending the application will affect the fairness of the proceeding. (3) The ACAT may amend an application to include an additional allegation even though the alleged conduct— (a) happened more than 3 years before the amendment is made; or (b) has not been the subject of a complaint or investigation under