they have a 6 step programme for dealing with modern slavery, page 6 of pdf

p.3

"These policies are designed to support ethical sourcing and labour standards and are based on the ILO labour standards, the UN Declaration on Human Rights, and the Guiding Principles for Business and Human Rights."

"The Code of Conduct explicitly states that Whistles expects all employment to be freely chosen and working conditions to be safe and hygienic. Child labour is prohibited, living wages are to be paid, working hours should not be excessive and workers should not be subjected to harsh or inhumane treatment.We ask all suppliers to sign our Code of Conduct, and we ask them to obtain the same from their sub-contractors to maintain consistent labour standards across all aspects of production. The supplier is responsible for ensuring that the Code of Conduct is implemented and adhered to by all of its approved subcontractors and business partners.We will only do business with suppliers that share our commitment to fair and safe labour practices and who sign up to our Code of Conduct."