Asda has been named the cheapest supermarket for branded groceries, beating both Tesco Clubcard and Sainsbury’s Nectar card prices, according to new research from consumer group Which?.The analysis found Asda offered the lowest prices on a basket of popular branded products from companies including Heinz, Cadbury, Kellogg’s and Nescafé.Which? tracked the prices of 241 branded grocery items throughout March 2026 and found the total cost of the ba…