Sales of factory-farmed chickens have slumped since a high-profile campaign raised awareness of the cruelty at the heart of the poultry industry. Sales of free-range poultry shot up by 35 per cent last month.Fearnley-Whittingstall intends to produce a new television show on chickens later this year, updating viewers on the campaign and urging more people to join what he hopes will turn into a free-range revolution. Read about the life of a battery chicken here.