On page 7 its states "The most effective process in managing risk is vigilance. Our employee and supplier base has clear standards to work to, in the Code of Conduct. Wood has established mechanisms for all stakeholders to raise issues to the company through our Responsible Officers, Ethics and Compliance team or anonymously, if required, through the Ethics hotline.". This shows that all parties are able to raise issues to the company about modern slavery and can do so anonymously.

pg. 4

"Ethics Hotline Aimed principally at our colleagues, but also available to others working in our supply chain. Confidential reporting channels are managed by a third party and concerns can be raised by phone or online in multiple languages."

It's anonymous so 'protection' also applies.

And 'all stakeholders' can also raise issues through 'Responsible Officers, Ethics and Compliance team'.