He says: "Hiding in plain sight is a very 21st century phrase but it doesn't just apply to perpetrators. Victims also hide in plain sight and no more so than modern slaves.
"We brush past them in the street, they work in car washes or nail bars, they pick fruit and they dig for cockles, they wait by the sides of roads struggling against the winter cold. It's a complex world right now and some people say, 'What difference can I make?' Well, to adapt a film name, lots actually."