s 11 Right to intervene
(1) The missing person's spouse, civil partner, parent, child or sibling may intervene in proceedings on an application under this Act for a declaration or a variation order. (2) The Attorney General may intervene in such proceedings, whether or not the court directs papers relating to the application to be sent to the Attorney General. (3) Any other person may intervene in such proceedings only with the permission of the court. (4) References in this section to intervening in proceedings include— (a) arguing before the court any question in relation to the application which the court considers it necessary to have fully argued, (b) in proceedings on an application for a declaration under this Act, seeking a determination or order under section 4, and (c) in proceedings on an application for a variation order, seeking a determination or order under section 7.