Supermarket Switching Guide 2026: Which UK Supermarket Is Actually Cheapest?

Based on consistent basket comparisons throughout 2025/26, the ranking is broadly: Aldi and Lidl (cheapest, neck and neck), followed by Asda, then Tesco, Morrisons, Sainsbury's, and finally Waitrose and M&S (most expensive). The difference is significant. A £70 weekly shop at Aldi would cost approximately £80-85 at Tesco, £85-90 at Sainsbury's, and £100+ at Waitrose. Over a year, that's a difference of £500-1,500. However, price isn't everything. Range, convenience, online delivery, and loyalty schemes all matter. The cheapest supermarket for your specific shopping habits might not be the cheapest on average.

Aldi and Lidl dominate on price across almost every category. Their business model — smaller stores, fewer products, high turnover — keeps costs down and savings are passed to shoppers. Product quality is genuinely comparable to big-name brands. Aldi's Specially Selected range and Lidl's Deluxe range regularly win taste awards. You're not sacrificing quality for price. The drawbacks: smaller range means you might not find specialty items, no online delivery from Aldi (Lidl has limited delivery), and the middle aisle chaos means you might leave with a kayak and a circular saw alongside your weekly shop.

If you prefer Tesco, Sainsbury's, Asda, or Morrisons for range and convenience, maximise their loyalty schemes to close the gap with discounters. Tesco Clubcard prices offer significant discounts — sometimes 30-50% off — on hundreds of products. Without a Clubcard, Tesco is expensive. With one, it's competitive. The Clubcard Plus subscription (£7.99/month) adds 10% off in-store twice a month. Sainsbury's Nectar prices work similarly, with discounts exclusive to Nectar card holders. Asda Rewards gives cashback on specific products. All of these are free to join and take 2 minutes to set up.

Many savvy shoppers do a main shop at Aldi or Lidl for staples (meat, veg, dairy, bread, tins) and a targeted top-up at a bigger supermarket for specific branded items or specialty ingredients. This hybrid approach captures 80% of the discount supermarket savings while still getting the products you specifically want from bigger stores. The key is discipline — the top-up shop should be targeted, not a full browse. Online shopping can actually save money by removing impulse purchases. You see only what you search for, and the basket total is visible throughout. If you struggle with in-store temptation, weekly online orders from a supermarket with competitive prices might be your best strategy.

Buy own-brand for everything except the few items where you genuinely prefer the brand. On most products, the taste difference is minimal or non-existent, but the price difference is 30-50%. Buy frozen vegetables instead of fresh. They're cheaper, last longer, are often more nutritious (frozen at peak freshness), and produce zero waste. Frozen fruit is perfect for smoothies and porridge. Buy whole chickens instead of breast fillets (half the price per kilo). Buy block cheese and grate it yourself (30% cheaper than pre-grated). Buy dried pasta and rice in bulk. These small switches compound into serious savings over a year.