Which UK supermarket should I shop at for the cheapest basket?

Direct answer

There is no single UK supermarket that is universally cheapest for every household; the best option depends on your specific location, basket contents, pack sizes, and travel costs.

Why straightforward comparisons are misleading

Price presentation and promotional complexity make it genuinely difficult to compare supermarkets fairly. The UK Competition and Markets Authority has examined how shoppers use unit pricing and how these factors affect their ability to make informed choices. Loyalty schemes, limited-time offers, and pack-size variations mean that what appears cheapest at first glance often isn't when you account for your actual shopping patterns.

What to compare: the key criteria

When evaluating where to shop, you need to consider unit pricing, the cost per kilogram or litre, rather than just the till total. However, unit price alone doesn't tell the full story. You must also factor in promotions and loyalty conditions, which vary significantly between retailers and can shift the overall cost of your basket.

Your circumstances are unique

Your actual basket, the specific items and quantities you buy, is fundamental to any meaningful comparison. The real cost of shopping extends beyond the till: travel and substitution costs matter, as does your location and the pack sizes you can actually use. A supermarket that appears cheapest for staples might not offer value on your specific purchases once you account for the effort and expense of shopping there.

Practical conclusion

Rather than seeking a universal answer, build a comparison around your own shopping habits and the criteria that apply to you. Check unit prices, account for the promotions and loyalty schemes you'll actually use, and include the real cost of getting there. Personalised comparison, grounded in your basket and circumstances, is the most reliable way to find where you'll spend least.

Sources

• CMA unit pricing analysis and consumer research (checked source date: 2024-01-30)
• CMA price transparency guidance (checked source date: 2025-11-01)