Tesco's become the fourth supermarket giant to start rationing tomatoes. Customers will also face limits on purchases of peppers and cucumbers - after Asda, Morrisons and Aldi took similar steps. But will our independent suppliers face the same issues? And what for the future of our food security? Julian speaks to Neil Bharadwa from the Cambridge Fruit Company and David Rose, Professor of Sustainable Agricultural Systems at Cranfield University.