First 100% British chocolate bar made since 1932 using Berkshire-grown cocoa

A chocolate bar made entirely from British ingredients sat on a table at the University of Reading in August 2026—the first of its kind in nearly a century. Maha Khan, a master's student in food security, had grown the cocoa, fermented it, dried it in the summer sun, roasted it, and ground it into the dark bar that now marked a peculiar milestone: the last time anyone had made chocolate from British-grown cocoa was 1932, when Rowntree's presented a six-year-old Princess Elizabeth with a bar made from the same soil.

The bar was named the Reading 100 Chocolate Bar to commemorate the university's centenary, but its real significance lay not in nostalgia but in what it revealed about the fragility of the food systems we take for granted. The UK's chocolate industry is worth £10.4 billion annually. Every single bar sold in British shops depends on cocoa imported from thousands of miles away—from the tropics of Africa, South America, and Asia. The cocoa Khan used came from the University of Reading's International Cocoa Quarantine Centre, a climate-controlled facility in Berkshire that houses more than 300 varieties of cocoa plant. The centre serves as a critical checkpoint: it quarantines cocoa for two years before releasing it to the 97 percent of cocoa-growing countries that depend on its research and germplasm.

Khan's project was not a stunt. She had set out to draw attention to the cascading threats facing cocoa production worldwide. Between 30 and 40 percent of the global cocoa crop is lost each year to pests, diseases, and increasingly, to climate change. The heatwaves that have swept across cocoa-growing regions in recent years are only accelerating the problem. When Khan spoke about her work on the BBC's Today programme, she was careful to frame the achievement in this context. Yes, it was remarkable that she could make 100 percent British chocolate. But the real story was what that rarity exposed: the vulnerability of smallholder farmers in tropical regions who grow cocoa in some of the world's most climate-exposed areas, and the dependence of an entire industry on supply chains that stretch across continents and grow more precarious each year.

The process itself was labor-intensive and unglamorous. Khan harvested the cocoa pods from the quarantine centre, removed the pulp and beans, and fermented them for seven to ten days. She laid the beans in the sun to dry—fortunate, she noted, that the summer weather cooperated. Then came roasting, winnowing, grinding, and blending with milk and sugar in the university's laboratory facilities. It was, she said simply, a lot of work. But it was also a window into the complexity of chocolate production, a reminder that the bar in your pocket represents months of labor by farmers, processors, and technicians working across multiple continents and climate zones.

Professor Carol Wagstaff, director of AgriFood Futures at the University of Reading, offered a measured perspective on what Khan's achievement meant. The UK chocolate industry, she noted, rests on a supply chain that begins in the tropics and depends on the economic stability of millions of smallholder farmers. While local production has obvious benefits—for health, for the economy, for the environment—it is not always the answer. International trade in food, when it works well, can provide economic security for communities while making efficient use of natural resources. What matters now is investment in research to protect those supply chains from the mounting threats of climate change, pests, and disease. Khan's chocolate bar, made in a laboratory in Berkshire from cocoa grown under controlled conditions, was a proof of concept. But it also underscored a harder truth: the future of chocolate depends not on making it all at home, but on understanding and protecting the global systems that currently make it possible.