There are no KPIs described in the MSS, just broad statements about their plans. They are still in the process of their 5-year strategy, so maybe once it is completed they will disclose KPIs. The only metric listed was the number of incidents reported which was zero.
"This is our sixth Modern Slavery Statement, and it outlines the steps we take as a business to prevent slavery and human trafficking in our own operations and supply chain. This document sets out the progress we made during 2021."
p. 3
"We have continued our work with the multi-stakeholder, modern slavery initiative, Stronger Together, through 2021 and expect to do so through 2022. We are continuing with our five-year strategy to identify areas where we can improve our systems and processes and ensure that we have robust mechanisms to identify, report and remediate issues. In 2020, we set about reviewing our Human Rights and Modern Slavery strategy, aligned with the United Nations Guiding Principles on Business and Human Rights, with the aim of improving our performance and creating robust mechanisms to lead to the eradication of modern slavery. Last year, we started working to embed this within the organisation. We acknowledge that the ongoing impact of Covid-19 on our business has slowed down our implementation of this strategy."
p. 5
"No incidents of modern slavery were noted or reported in 2021."
p. 7