A British farmer produces the world's most expensive milk - from horses and costing £13 a pint. Frank Shellard runs the only farm in Britain to commercially produce the alternative dairy product. He says he got the idea to cure his daughter's eczema. Frank's family business Combe Hay Mare’s Milk has fourteen mares producing 12-14 litres a day to make milk, hand cream and lotion. Frank says his mare’s milk is far sweeter, with a much lower fat content than cow milk - and says its drunk by over 30 million people around the world. Frank, 62, got the idea...