How does Which? determine the cheapest supermarket in 2026?

Which? determines the cheapest supermarket in 2026 through a comprehensive, data-driven methodology that involves price tracking across a representative basket of goods. The consumer organization regularly monitors prices at major UK supermarkets including Tesco, Sainsbury's, Asda, Morrisons, Aldi, and Lidl. Their analysis typically includes over 100 commonly purchased items spanning categories like fresh produce, dairy, meat, pantry staples, and household essentials. Prices are collected weekly or monthly from both physical stores and online platforms to account for regional variations and digital pricing strategies. The data is weighted to reflect typical shopping patterns, with frequently bought items carrying more significance in the final calculation. Which? also factors in promotional offers, loyalty card discounts, and multi-buy deals that are consistently available, but excludes short-term flash sales or one-time coupons. Their annual report provides both an overall cheapest supermarket ranking and category-specific comparisons, helping consumers understand where to shop for different types of items. This rigorous approach ensures their findings are statistically robust and practically useful for budget-conscious shoppers.

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