Hope that they have created a culture where staff feel comfortable coming forward with concerns but if not, they do have a Whistleblower Policy and anonymous means of reporting available to them and to third-party reporters (which I assume includes supply chain workers). On page 10 they explain, "ACo’s Whistleblower Policy outlines comprehensive reporting procedures and mechanisms which enable employees or third parties to report concerns regarding Misconduct, including in relation to modern slavery. Should a reporting party wish to remain anonymous, they can report online, by phone or by email through our independently operated whistleblower system" (pg. 10).