There's a bewildering world of milk alternatives. From oats, to tiger nuts, the list of varieties keeps growing but not everyone’s delighted about the march of plant based drinks. Some dairy farmers worry that the rural economy is at risk and just don’t get the hype. Elizabeth Hotson talks to plant-based pioneers, Camilla Barnard, co-founder of Rude Health and Alpro's General Manager Sue Garfitt. We also hear from ex-beef and dairy farmer Jay Wilde who now produces oat milk at his farm in Derbyshire in the north of England. And Carrie Mess, a Wisconsin dairy farmer and speaker on agriculture puts forward the case for cows' milk, whilst Deborah Valenze, author of Milk: a Local and Global History tells us the story behind milk consumption. Presenter: Elizabeth Hotson Producer: Sarah Treanor (Photo of various kinds of plant milk. Photo Credit: Getty Images).