The country’s biggest supermarkets, including Tesco and Sainsbury’s, have sounded the alarm over Britain’s food supplies amid a heatwave and wildfires in Europe. Anna Taylor, executive director of the Food Foundation, said that the UK food system is ‘dangerously exposed to shocks far beyond our borders’. This has resulted in higher food prices and the poorest families struggling to buy fresh fruit and vegetables, she said. Sainsbury’s chief executive, Simon Roberts, said: ‘Recent weeks have shown just how much pressure our food system is under. We need a more resilient food system that attracts investment, backs British farmers and helps keep affordable, nutritious food on tables across the nation.’