Signatories, including food retailers Tesco and Sainsbury's and dairy producer Danone, called on Burnham to urgently introduce a "Good Food Bill" to improve food security, resilience and public health. The letter, published on Thursday, said Britain's food system had suffered repeated shocks in recent years, with farmers and growers facing rising costs and increasing pressure from climate change and nature loss. "The next food shock is not a question of if, but when. To meet it prepared, food has to stop being an afterthought for the Government," the letter, organised by charity the Food Foundation, said. It warned that wildfires across Europe and heightened geopolitical tensions had exposed the fragility of the UK's food system, while diet-related disease had reached record levels.