Modern Slavery - do you have supply chain policy?

Some new research out this week suggesting that only 5% of large companies have policy on slavery in the supply chain. Anyone out there have a policy in place? Or, experience of developing/adopting one? Research quoted is here - http://www.supplymanagement.com/blog/2015/07/modern-slavery-act-many-global-businesses-still-unprepared-for-new-law