There's a distinct aroma of cow manure at the Duke of Westminster's dairy farm near Chester, which is a world away from the grand West End properties that underpin his near £10bn fortune. A decade after becoming Britain's youngest billionaire, his 349-year-old Grosvenor empire includes Lea Manor Farm on the Eaton Estate in north-west England, which has fared better than most dairy farms recently - though 'better' is a relative term when you're up against a 50% price crash.
Mark Roach, managing director of Grosvenor Farms, notes that milk prices are cyclical: last year's higher farm-gate prices encouraged expansion, and oversupply has led to price cuts of up to 50% this year. "I can't imagine any other industries suffering a 50% reduction," he says, likely while staring at a very unimpressed cow.
Lea Manor has been arable and livestock for centuries, focusing on potatoes from 1984 to 2002 before switching to cows after realizing that growing spuds on heavy Cheshire clay was a losing game. Now it boasts 77 staff and 2,600 Holstein Friesian cows, producing over 34 million litres of milk a year - 13,200 litres per cow - supplying Müller and Tesco. All set within 4,685 hectares (11,577 acres) of land.
This year's heatwaves, supercharged by the escalating climate crisis, have piled on the pressure. When temperatures exceed 25°C, cows become lethargic, eat less, and produce less milk. During June's 36°C heatwave, each Grosvenor cow produced up to six litres less milk a day, with sprinklers and airy barns mitigating some damage. At other farms, yields dropped as much as 10 litres per cow daily. "It's very, very challenging for farming," Roach says, understating it like a true aristocrat.
Mark Preston, an executive trustee of Grosvenor, warns: "Extreme weather in many parts of the northern hemisphere is affecting crop yields and farm economics. Farmers are adapting where they can, but the full impact is likely to become clearer over the next growing season, reinforcing the importance of building greater resilience into the UK's food production system." Translation: we're all a bit stuffed, but let's keep it civil.
With almost three-quarters of England and all of Wales officially in drought, wheat at half its normal height, and broccoli yields down 50%, the UK is importing more food from countries like Spain, while global prices rise. Brexit hasn't helped either, with the flow of eastern European workers drying up faster than a Cheshire field in July.
Many British farms are lossmaking, but Lea Manor - Grosvenor's only dairy farm - remains profitable after a revamp starting in 2012 to boost efficiency with technology. The farming division made a pre-tax profit of £2.6m in 2024, down from £3.6m the previous year, on turnover of £16.2m. By contrast, Grosvenor's UK properties pulled in an underlying profit of £88.7m last year, up 14% on 2024. The duke received dividends of £53.7m from the group in 2025.
Despite the scale discrepancy, Roach insists the farm is "not a hobby of the duke, it's a commercial business." Hugh Grosvenor, with an estimated fortune of £9.5bn, inherited the estate in 2016 upon his father's sudden death. The bequest was largely shielded from 40% inheritance tax because the estate is held in trusts, paying a recurring 6% on asset value every 10 years instead.
At Lea Manor, cows are led three times daily to an indoor carousel for automated milking. The milking unit attaches manually but detaches automatically to prevent overmilking, with robots cleaning teats before and disinfecting after. In 60 berths, 360 cows can be milked in an hour. Three tankers are filled daily with 29,000 litres each, plus a part-filled one, heading to a Müller plant in Manchester, with milk on Tesco shelves the next morning.
Sensors in the floor monitor cow gait, so sore feet get a foot bath to prevent rot. Occasionally, cows refuse to leave the carousel and need guidance back to their barn - because even cows appreciate a good spin.
Recurring bovine tuberculosis plagues dairy farms, with unreliable testing and no vaccine. Sheep farmers battle bluetongue, an insect-borne virus, as changing weather patterns bring new diseases.
The rise of factory-style dairy farming raises welfare concerns about "battery cows." Grosvenor insists its cows are healthy, pointing to its stats: "Unhealthy cows do not produce much milk," Roach says. Though not organic, the cows eat grass and have no routine antibiotics. The barns are larger than industry standards and open-sided for light and airflow, but cows are housed year-round on concrete floors (with anti-slip grooves). Only 8% of UK dairy herds are housed all year, per the RSPCA, which advocates for some grazing. Grosvenor says the RSPCA described its herd as "one of the quietest and most content" they'd seen.
Grosvenor is building a biomethane plant on the estate to turn cow manure into energy, broadening revenue streams. The 2.4-hectare (six-acre) facility is expected to generate 72 gigawatts of renewable gas annually from up to 170,000 tonnes of manure, enough to heat about 6,000 homes, starting in 2027. It's not alone: Apsley Farms in Hampshire, owned by the Du Val de Beaulieu family since 1936, runs the UK's third largest biomethane plant, generating 104GWh of green gas a year and supplying 10,000 households.
Manure also fertilizes Grosvenor's fields, meaning over 80% of the forage fed to the dairy herd is grown without artificial fertilisers. This circular farming system - turning crop waste into feed and animal waste into natural fertiliser - has let the group avoid mined phosphate and potash fertilisers for about 15 years, buying only some nitrogen.
The near-total blockade of the Strait of Hormuz during the Iran war has caused global fertiliser shortages, described as a "food security timebomb" by David Miliband of the International Rescue Committee. Preston echoed concerns in May, warning of knock-on effects on food prices next year. "The concerns we raised earlier this year remain very real," he says. "Ongoing disruption to fertiliser supply chains continues to affect both availability and cost." So, the duke's cows are feeling the pinch, but at least they have a nice carousel to distract them.