For the purposes of this Act, a member of a trade union is a "contributor" to the political fund of the union unless an opt-out notice given by the member to the union has effect (see subsection (3)).
An "opt-out notice" is a notice that the member opts out of being a contributor.
An opt-out notice has effect on and after the relevant day unless the member withdraws the notice.
In subsection (3), "the relevant day" means—
the day on which the opt-out notice is given;
A member of a trade union withdraws an opt-out notice by giving the union notice of the withdrawal (a "withdrawal notice").
A member of a trade union may give an opt-out notice or a withdrawal notice—
The Secretary of State must, before the end of the period of three months beginning with the day on which this section comes into force, publish guidance about the kind of provision which the Secretary of State considers it is appropriate for the rules of a trade union to make for the purposes of subsection (4)(b)(i).
The Secretary of State—