23 When access to workplaces may be denied on religious grounds

A representative of a union may be denied access to a workplace if—

(a)

all the employees employed in the workplace are employed by an employer who holds a current certificate of exemption issued under section 24; and

(b)

none of the employees employed in the workplace is a member of a union; and

(c)

there are no more than 20 employees employed to work in the workplace.