‘It bloody works’: why the world’s oldest cheddar-maker uses a ‘milk-source’ heat pump

Barber’s Farmhouse Cheesemakers can draw enough heat from cows’ fresh milk to bring water close to the boil, slashing carbon emissionsIn many ways, the world’s oldest cheddar-maker hews to tradition. Since 1833, Barber’s Farmhouse Cheesemakers has operated from the rolling green pastures of south-west England, milking grass-fed cows and fermenting the milk with microbial starters passed down for generations. That heritage has led to award-winning cheese, now popular acros