Animal welfare is one of the UK’s most successful exports. When the late Peter Roberts, a Hampshire dairy farmer, founded the charity Compassion in World Farming (ciwf.org.uk) 50 years ago, he rightly feared that industrialised farming would wreak havoc on animals and the planet. Even he couldn’t have envisaged today’s numbers: 70 billion animals are reared globally for meat, milk and eggs each year and two thirds of farm animals are reared intensively. We call