not on homepage, but on its CSR page (which is linked from the homepage) you can find the link to their MSA policy
Even though the statement is available on a relevant page, it is not in an intuitive drop-down nor does the document have a name that clearly signifies that it is their Modern Slavery Act statement.
You would be able to find it by 1) selecting the "Company" drop-down, 2) selecting the "Corporate Social Responsibility" page, 3) downloading their "PCI Pharma Services Ethical Statement".