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"Since 2020, we’ve required all of our new suppliers to provide written confirmationthat they’ll adhere to OVO’s Supplier Code of Conduct."
The company does explicitly state that suppliers must adhere to code of conduct (incl. complying with laws and having clauses on slavery), but does not explicitly mention child labour for ex.
"OVO’s Supplier Code of Conduct sets out the standards, principles and values that OVO expects suppliers and business partners to uphold, including a commitment to eradicating modern slavery. The Code was refreshed this year and now includes explicit reference to expecting our business partners to respect and uphold human rights in accordance with legal requirements and international human rights standards and ensure that they are taking appropriate steps to prevent modern slavery and human trafficking existing within their business and its supply chain."