Kevin Mackay is standing in front of hundreds of pairs of eyes at Lawns Park primary school in Leeds, all trained on a bright orange stuffed fox called Fred. “So Fred, which of these foods did supermarkets throw away?” He gestures to the giant pictures projected onto the back of the school hall: a cucumber, a tub of hot chocolate, a bunch of bananas. At each item, Fred raises his hand and the children’s eyes grow a bit wider. “That’s right, all these foods were thrown away by supermarkets,” Kevin says. Then he asks the children: “What could be done with this food instead?”