s 146 Declaration in respect of void term, etc.
(1) A qualifying person (P) may make a complaint to an employment tribunal that a term is void, or that a rule is unenforceable, as a result of section 145. (2) But subsection (1) applies only if— (a) the term or rule may in the future have effect in relation to P, and (b) where the complaint alleges that the term or rule provides for treatment of a description prohibited by this Act, P may in the future be subjected to treatment that would (if P were subjected to it in present circumstances) be of that description. (3) If the tribunal finds that the complaint is well-founded, it must make an order declaring that the term is void or the rule is unenforceable. (4) An order under this section may include provision in respect of a period before the making of the order. (5) In the case of a complaint about a term of a collective agreement, where the term is one made by or on behalf of a person of a description specified in the first column of the table, a qualifying person is a person of a description specified in the second column. (6) In the case of a complaint about a rule of an undertaking, where the rule is one made by or on behalf of a person of a description specified in the first column of the table, a qualifying person is a person of a description specified in the second column.