I wasn't sure how to answer this question. Page 13 of the MSS refers to (1) Anti-Slavery Policy (2) Supplier Agreements and (3) Supplier Code of Conduct, but doesn't specify if it is only Tier 1 or beyond. So for this reason I check 'unknown'. I'll leave this answer to someone with more experience than me to answer.
See Page 14: "Supplier Agreements. Our Supplier Agreement stipulates the terms and conditions required to be a supplier and was updated during the reporting period to include contractual provisions relating to modern slavery.
Supplier Code of Conduct. Our Code sets out our performance and behavioural expectations for our suppliers and, similarly, was updated during the reporting period to include modern slavery considerations."
pg. 13
"Code of Conduct.
Our Code of Conduct provides advice and guidance on how our employees, contractors, consultants, and board members should conduct business, ethically, and in accordance with all applicable laws, regulations and policies. "
pg. 13
"Code of Conduct.
Our Code of Conduct provides advice and guidance on how our employees, contractors, consultants, and board members should conduct business, ethically, and in accordance with all applicable laws, regulations and policies. "