"(1) This section applies to any work for a person ("the principal") which is available for doing by individuals ("contract workers") who are employed not by the principal himself but by another person, who supplies them under a contract made with the principal."
"It is unlawful for the principal, in relation to work to which this section applies, to discriminate against a contract worker – …… (b) by not allowing him to do it or continue to do it …."